Precons with Ghalta, Primal Hunger

Ghalta, Primal Hunger

Legendary Creature — Elder Dinosaur

This spell costs less to cast, where X is the total power of creatures you control.Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

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Various cultures of Ixalan tell stories of the monsters of legend that ended up as gristle between Ghalta's teeth.