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Ethersworn Canonist - Canonist buys you a big pile of time against combo and Elves

This thing is great at letting all players tap their lands EOT and then save that mana for future use

Alpha Black Back Error The most famous one is the Alpha Black Back (also known as "Additional Ink Error")

(When a creature with afterlife 1 dies, create a 1/1 white and black Spirit creature token with flying.) Because blockers are chosen all at once, you can't block with a creature with afterlife, wait for it to die, then block with the resulting Spirit tokens

Let's take a look at a classic example: the turn-one mana accelerator

This happens at times when you, as an experienced MTG Arena player, think "Oh, I'd better go into full control or set a stop on a phase where I don't normally get a stop." Except you don't, because smart priority does it for you