Dizzy Punch lets you flip two coins, and for each head, you do 30 damage
"This hand is too weak." The first important lesson I learned with Affinity was in round 4 when I kept this hand of seven in game 3 against a Jund (splash white) deck
Since your commander is focused on playing more Eldrazi, most spells are Eldrazi spells around a third of the deck, and that matters because whenever you cast an Eldrazi spell, you can pay 2 colorless mana to copy all spells you control, then copy all your triggered abilities and activated abilities on the stack
These are the white cards you should bring to the table if you have a mono-white deck, but want to be able to play some costly, mana-intensive spells
Polygon did not confirm that GameStop would offer store credit for the trade-in value of cards, but its difficult to imagine otherwise