Undyne, Sword of Justice

First Strike, Menace, Mold Breaker
Symbiosis--{u}{u}, {t}: Undyne deals 2 damage to target attacking or blocking creature. Put a +1/+1 counter on Undyne. Activate this ability only if you control a permanent of another color.
Whenever undyne attacks or blocks alone, remove all +1/+1 counters from Undyne. Undyne deals X damage to target creature or player, where X is the number of counters removed this way -3.