Unbound Flourishing [Modern Horizons] Elf Ignore this effect for each

Ignore this effect for each creature the player didn't control continuously since the beginning of the turn

If each of those creatures could block all creatures that the other is blocking

if you control at least five other Mountains

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

When Hangarback Walker dies

Unbound Flourishing [Modern Horizons] Elf Ignore this effect for eachSet: 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.