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Heartstone

Premium Deck Series: Slivers — uncommon

Artifact

Heartstone rulings:

2016-06-08: Activated abilities contain a colon. They’re generally written “[Cost]: [Effect].” Some keywords are activated abilities and will have colons in their reminder text.

2006-07-15: Can’t reduce Snow mana costs.

2004-10-04: The cost reduction can be applied to additional costs.

2004-10-04: It will not add a to abilities with no generic mana in their activation cost.

2004-10-04: It will never reduce any colored mana portion of an activation cost.

Rating:

8.98/10

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Agatha of the Vile Cauldron

Legendary Creature — Human Warlock (1/1)

Activated abilities of creatures you control cost less to activate, where X is Agatha of the Vile Cauldron's power. This effect can't reduce the mana in that cost to less than one mana.
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7.6 /10

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Biomancer's Familiar

Creature — Mutant (2/2)

Activated abilities of creatures you control cost less to activate. This effect can't reduce the mana in that cost to less than one mana.
: The next time target creature adapts this turn, it adapts as though it had no +1/+1 counters on it.

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Training Grounds

Enchantment

Activated abilities of creatures you control cost less to activate. This effect can't reduce the mana in that cost to less than one mana.

9.6 /10

Forensic Gadgeteer

Creature — Vedalken Artificer Detective (2/3)

Whenever you cast an artifact spell, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")
Activated abilities of artifacts you control cost less to activate. This effect can't reduce the mana in that cost to less than one mana.

8 /10

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Power Artifact

Enchantment — Aura

Enchant artifact
Enchanted artifact's activated abilities cost less to activate. This effect can't reduce the mana in that cost to less than one mana.

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Zirda, the Dawnwaker

Legendary Creature — Elemental Fox (3/3)

Companion — Each permanent card in your starting deck has an activated ability. (If this card is your chosen companion, you may put it into your hand from outside the game for as a sorcery.)
Abilities you activate that aren't mana abilities cost less to activate. This effect can't reduce the mana in that cost to less than one mana.
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Convergence of Dominion

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Dynastic Command Node — As long as you control your commander, activated abilities of cards in your graveyard cost less to activate. This effect can't reduce the mana in that ability's activation cost to less than one mana.
Translocation Protocols — , : Mill three cards.

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Drana and Linvala

Legendary Creature — Vampire Angel (3/4)

Flying, vigilance
Activated abilities of creatures your opponents control can't be activated.
Drana and Linvala has all activated abilities of all creatures your opponents control. You may spend mana as though it were mana of any color to activate those abilities.

9.3 /10

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Anointed Peacekeeper

Creature — Human Cleric (3/3)

Vigilance
As Anointed Peacekeeper enters the battlefield, look at an opponent's hand, then choose any card name.
Spells your opponents cast with the chosen name cost more to cast.
Activated abilities of sources with the chosen name cost more to activate unless they're mana abilities.

4.9 /10

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Ayesha Tanaka

Legendary Creature — Human Artificer (2/2)

Banding (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)
: Counter target activated ability from an artifact source unless that ability's controller pays . (Mana abilities can't be targeted.)

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Azorius Justiciar

Creature — Human Wizard (2/2)

When Azorius Justiciar enters the battlefield, detain up to two target creatures your opponents control. (Until your next turn, those creatures can't attack or block and their activated abilities can't be activated.)

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Blossoming Tortoise

Creature — Turtle (3/3)

Whenever Blossoming Tortoise enters the battlefield or attacks, mill three cards, then return a land card from your graveyard to the battlefield tapped.
Activated abilities of lands you control cost less to activate.
Land creatures you control get +1/+1.

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Damping Matrix

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Activated abilities of artifacts and creatures can't be activated unless they're mana abilities.

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Katabatic Winds

Enchantment

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Lavinia of the Tenth

Legendary Creature — Human Soldier (4/4)

Protection from red
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7.7 /10

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Linvala, Keeper of Silence

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Flying
Activated abilities of creatures your opponents control can't be activated.

9.5 /10

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Linvala, Shield of Sea Gate

Legendary Creature — Angel Wizard (3/3)

Flying
At the beginning of combat on your turn, if you have a full party, choose target nonland permanent an opponent controls. Until your next turn, it can't attack or block, and its activated abilities can't be activated.
Sacrifice Linvala: Choose hexproof or indestructible. Creatures you control gain that ability until end of turn.

8.5 /10

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Lyev Decree

Sorcery

Detain up to two target creatures your opponents control. (Until your next turn, those creatures can't attack or block and their activated abilities can't be activated.)

2.3 /10

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Creature — Shapeshifter (3/3)

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Changeling (This card is every creature type.)
Double strike

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Angel's Grace

Instant

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
You can't lose the game this turn and your opponents can't win the game this turn. Until end of turn, damage that would reduce your life total to less than 1 reduces it to 1 instead.