You'll gain infinite life
(It's an artifact with ", , Discard a card, Sacrifice this token: Draw a card.") Creature - Vampire Soldier Restless Bloodseeker At the beginning of your end step, if you gained life this turn, create a Blood token
Commander owyn, Shieldmaiden First strike At the beginning of combat on your turn, if another Human entered the battlefield under your control this turn, create two 2/2 red Human Knight creature tokens with trample and haste
There have been other impactful ones since this Kaladesh (2016) card, but this was a key card in Standard for its whole stay and has also seen play in both Modern and Pioneer, as well as Explorer
Width 206 mm
If you haven't heard that giving your opponent's choices is bad in Magic , it really matters on this card