Aether Revolt — Common
Destructive Tampering rulings:
2/9/2017 : You choose which mode youre using as you cast Destructive Tampering. Once this choice is made, it cant be changed.
2/9/2017 : Because the effect of Destructive Tamperings second mode doesnt change the characteristics of any permanents, the set of creatures affected by it is constantly updated. Creatures without flying that enter the battlefield later in the turn wont be able to block.