Kokodril Wyvern

Flying, lurch (This permanent doesn't untap
during your untap step.)

Whenever a land enters the battlefield under an
opponent's control, if Kokodril Wyvern is
untapped, you may tap it. If you do, that player
may sacrifice a land, If they don't, Kokodril
Wyvern deals 4 damage to them.

{1}{r}: Untap Kokodril Wyvern.