Thousand Sigil, Original Curse

When Thousand Sigil, Original Curse enters the battlefield, until the start of you next turn, if a creature would enter the battlefield under your control, banish it instead.
{p/b}{p/g}: Exile one or more creatures from every graveyard with the same CMC, Search your
library or a creature with CMC one greater than
the exiled creatures, then place X XYZ counters
on it, where X is the number of creatures exiled
with this ability.