MAGIC: THE GATHERING
|Edition:||Scars of Mirrodin|
Target creature gets +1/+0 and gains infect until end of turn. (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
A very nastry trick to sneak out a win. Being able to give a creature infect at instant speed means one solid hit can be game ending instead. Combo this with cheap power boosting like Become Immense for stunning victories.