If you are deciding what to discard with Faithless Looting, generally the big creatures are the most obvious choice unless its post-board and you want to hold them either for Show and Tell or not wanting to expose it to a card like Soul-Guide Lantern
This can help them earn more gold, which can be used to participate in other events or purchase more things from the store
As soon as a new Magic: The Gathering set is fully spoiled, those clever folk at DraftSim get to work creating a simulated draft experience lickedy-split, so players can learn the new Limited format, before the cards are even out
You may interrupt your own spells, and you and your rival can play more than one interrupt at a time
You can also use excess mana on activated abilities, like those on Steel Hellkite or Prophet of Distortion
Combat After you attack, if you don't have good blockers, you might end the turn