Unbound Flourishing [Modern Horizons] Elf Sacrifice another creature: Put a

Sacrifice another creature: Put a -1/-1 counter on up to one target creature and draw a card

if you control at least five other Mountains

Put the exiled cards on the bottom of your library in a random order

When Hangarback Walker dies

put a fuse counter on Goblin Bomb

Unbound Flourishing [Modern Horizons] Elf Sacrifice another creature: Put aSet: Modern Horizons 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.