Kethek, Crucible Goliath {2}{B}{R}
Legendary Creature — Phyrexian Beast
At the beginning of your end step, you may sacrifice another creature. If you do, reveal cards from the top of your library until you reveal a nonlegendary creature card with lesser mana value, put it onto the battlefield, then put the rest on the bottom of your library in a random order.
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Industrial Advancement 86%
$5.38#6392
"At the beginning of your end step, you may sacrifice a creature. If you do, look at the top X cards of your library, where X is that creature's mana value. You may put a creature card from among them onto the battlefield. Put the rest on the bottom of your library in a random order."
Feed the Pack 85%
$0.45#11339
"At the beginning of your end step, you may sacrifice a nontoken creature. If you do, create X 2/2 green Wolf creature tokens, where X is the sacrificed creature's toughness."
Ziatora, the Incinerator 83%
$0.47#3066
"At the beginning of your end step, you may sacrifice another creature. When you do, this card deals damage equal to that creature's power to any target and you create three Treasure tokens."
Keldon Twilight 82%
$0.44#25268
"At the beginning of each player's end step, if no creatures attacked this turn, that player sacrifices a creature of their choice that they controlled since the beginning of the turn."
Skizzik 82%
$0.14#21247
"At the beginning of the end step, if this creature wasn't kicked, sacrifice it."