You wont be able to hop on and play a complete match during a commercial break or while waiting in line at the grocery store, but you can definitely fit a few in during a bus ride or between meetings at work
You could choose one and spare most of your creatures while surely removing most, if not all, of the creatures on opposing battlefields
Persistent Petitioners Play one Persistent Petitioners , and you've got a cheap, small creature to help keep you alive and mill a few of your opponent's cards while you get the mill factory started
At a cost of seven Ink, it isnt cheap to play, but if you have a character that costs seven or more on the field, you can tap it to play Be Prepared without paying its Ink cost
If you are attacked by a creature, no matter if that creature is coming at you or one of your planeswalkers, that creatures controller loses one life for each creature
It can build a board presence very quickly thanks to how easily it can generate a board state with creature tokens and cast your expensive spells with how many lands can hit the battlefield quickly