Underground River

(T: Add W.)

Whenever this creature attacks alone, it gets +2/+0 until end of turn.

T: This creature deals 1 damage to target attacking or blocking creature.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

T: This creature deals 1 damage to target attacking or blocking creature.

When this creature dies, target creature gets -1/-1 until end of turn.

You and target opponent each flip a coin. Mana Clash deals 1 damage to each player whose coin comes up tails. Repeat this process until both players' coins come up heads on the same flip.