Trample, Haste

Whenever Zilla deals combat damage to a player, if there's no monarch, that player becomes the monarch.

Whenever an opponent draws a card, if they're the monarch, they lose 2 life and you gain 2 life.

At the beginning of your endstep, if you're the monarch, create three 0/2 Egg creature tokens with Defender and "Whenever this creature dies, create a 3/3 Lizard Mutant with Haste."