Sneak Attack — Whenever this creature attacks, roll a d20.
1-9 | this creature gains deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) until end of turn.
10-19 | It gets +1/+0 and gains deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) until end of turn.
20 | It gets +3/+0 and gains first strike (This creature deals combat damage before creatures without first strike.) and deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) until end of turn.