Reeoku, Hunter of Eons

When Reeoku enters the battlefield, you may sacrifice
a creature or artifact. If you do, search your library
for an Equipment card and reveal it. If you reveal a
card named Permafrost, Weight of Legacy this way,
put it onto the battlefield. Otherwise, put that card
into your hand. Then shuffle.

Whenever an equipped creature you control attacks,
that creature gains trample, first strike, or deathtouch
until the end of turn.