Daktokros, Mouth of the World

Daktokros costs {x} more to cast where X is
your life total.
Whenever another creature card is put into a
graveyard from anywhere, put it onto the
battlefield under your control instead. It gains
haste, and "At the beginning of the next end
step or if this creature would die, exile it."
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Canyons were once thought to be natural.