Krodin, the Grim Wanderer

Flash, indestructible, mountainwalk, forestwalk
{3}, {t}: Create a 2/2 green Wolf creature token.
{4}, {t}: Create two 1/1 red Viper creature tokens
with deathtouch.
{5}, {t}: Populate. Then, if you control 10 or more
creature tokens, you may destroy all creatures.