If you do, Thief of Existence gains "When this creature leaves the battlefield, target opponent draws a card." When you cast this spell, exile up to one target noncreature, nonland permanent an opponent controls with mana value 4 or less
If multiple creatures enter at the same time, evolve may trigger multiple times, although the stat comparison will take place each time one of those abilities tries to resolve
No Double Dipping Make sure you havent redeemed a specific type of code before you buy it
While this generally has less of an impact than the likes of tutors or fast mana, it can increase both speed and consistency
You cast this card, make your opponent lose 1 life, cast another ally, make them lose 2 life, and so on
Thats not much to write home about