kronosaurus

Kronosaurus is unblockable as long as you control five or more basic islands.
Annihilator 2 (Whenever this creature attacks, defending player sacrifices two permanents.)
kronosaurus attacks each turn if able.
Kronosaurus is an extinct genus of short-necked pliosaur. With an estimated length of 9 to 10.5 metres, it was among the largest pliosaurs, and is named after the leader of the Greek Titans,