Unbound Flourishing [The List] Eldrazi Drone [-2] You may sacrifice a

[-2] You may sacrifice a creature

where X is 1 plus the sacrificed creature's mana value

Flaps can be detached and clipped to the back side to save precious space at the gaming table

choose a creature type

If one or more +1/+1 counters would be put on a creature

Unbound Flourishing [The List] Eldrazi Drone [-2] You may sacrifice aSet: The List Type: Enchantment Rarity: Mythic Cost: {2}{G} Whenever you cast a permanent spell with a mana cost that contains {X}, double the value of X. Whenever you cast an instant or sorcery spell or activate an ability, if that spell's mana cost or that ability's activation cost contains {X}, copy that spell or ability. You may choose new targets for the copy.