Fists of Ironwood
Ravnica: City of Guilds — common
Enchantment — Aura
Fists of Ironwood rulings:
2017-03-14: You create the Saproling tokens, even if Fists of Ironwood enters the battlefield attached to another player’s creature.
2017-03-14: The Saproling tokens aren’t created until after Fists of Ironwood is on the battlefield, so you can’t cast Fists of Ironwood on one of those tokens.
2017-03-14: If the target creature is an illegal target when Fists of Ironwood tries to resolve, Fists of Ironwood won’t resolve and won’t enter the battlefield. You won’t create Saproling tokens.