Grisprax, Bosun of Avarokk

When Grisprax enters the battlefield, target
opponent taps lands equal to the number of
Treasure tokens they control.
{1}, Sacrifice a Treasure token; Tap target land
an opponent controls. They create a Treasure
token.
When Grisprax leaves the battlefield, gain X
Treasure tokens, where X is the mana cost of
the spell that destroyed Grisprax.