Vritra, the Drought Wyvern

Flying, first strike
Whenever Vritra, the Drought Wyvern deals
combat damage to a player, you may pay
{2}{r}{w}. If you do, creatures you control gain
trample and lifelink until end of turn.
{2}{r}, Discard a card: Target creature you control
and target creature you don't control deals
damage to each other equal to it's power.