Bear Trap

If two or more creatures with base power and
toughness 2/2 entered the battlefield under an
opponent's control this turn, you may pay {0} rather than pay Bear Trap's mana cost.
All creatures get -2/-2 until end of turn.
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"This should deal with your bear problem, but won't
do much else. Not that you want me for anything else."
--Linden, Bear Trapper