Underground River

Add RRR.

Whenever this creature attacks, flip two coins. If both coins come up heads, this creature gains double strike until end of turn. If both coins come up tails, this creature gains menace until end of turn.

Flash Ward 2 Probing Telepathy — Whenever a creature entering under an opponent's control causes a triggered ability of that creature to trigger, you may copy that ability. You may choose new targets for the copy.

When Jared Carthalion enters, target opponent becomes the monarch. You can't become the monarch this turn. If damage would be dealt to Jared Carthalion while you're the monarch, prevent that damage and put that many +1/+1 counters on it.

This creature gets -1/-1 for each card in your hand.

Prevent all combat damage that would be dealt this turn. Flashback 2G (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Other snow and Zombie creatures you control get +1/+1. SSS: Return this card from your graveyard to the battlefield tapped. (S can be paid with one mana from a snow source.)

When Legion's Landing enters, create a 1/1 white Vampire creature token with lifelink. When you attack with three or more creatures, transform Legion's Landing.