Darkroot Viper

Discard a creature card: Put a +1/+1 counter on Darkroot Viper.
{g}, Exile a creature card from your graveyard:
Put a +1/+1 counter on Darkroot Viper. If that creature card had deathtouch, Darkroot Viper gains deathtouch until end of turn. The same is true for hexproof, reach, and trample.