Skithiryx, the Virulent Flame

Flying, haste

Landfall — Whenever a land you control enters, target opponent gets a poison counter.

Corrupted — As long as an opponent has three
or more poison counters, Skithiryx, the Virulent Flame gets +2/+2 and has "Whenever this creature attacks, choose up to three different targets. This creature deals 4 damage to each of those targets."