Caustic

Intimidate
This card gains a counter every time your turn
ends. (max 4 counters)
{u}Places a gas trap token. Only 1 gas trap
token can be on the field at a time. enemy
attackers trigger the token, causing them
to lose 1 toughness. (token expires after use)
{4}Counters: Caustic releases Nox Gas,
reducing the power of all enemy creatures
by 1 until the end of that turn