Underground River

(T: Add B.)

All creatures get -4/-4 until end of turn.

Whipflare deals 2 damage to each nonartifact creature.

Whenever one or more creatures attack, you may have target attacking creature gain double strike until end of turn.

Target player sacrifices an attacking creature of their choice. You create X 1/1 white Soldier creature tokens, where X is that creature's toughness.

At the beginning of your upkeep, each player may put two +1/+1 counters on a creature they control. If a player does, creatures that player controls can't attack you or planeswalkers you control until your next turn.

Flash When this creature enters, prevent all damage that would be dealt to you this turn. Whenever damage that would be dealt to you is prevented, put that many +1/+1 counters on this creature.

Undaunted (This spell costs 1 less to cast for each opponent.) Destroy all creatures.