Unbound Flourishing [Modern Horizons] Locus which possess the stability of

which possess the stability of ancient mountains

" —Ku-Ku

You may have it block an attacking creature of your choice

then Combustible Gearhulk deals damage to that player equal to the total mana value of those cards

it's affected by summoning sickness

Unbound Flourishing [Modern Horizons] Locus which possess the stability ofSet: 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.