Prevent all damage that would be dealt to you this turn
Until then, make it a point to learn about one new Magic card per day to keep expanding your Magic: The Gathering knowledge
Seal of Cleansing just sits on the board daring the opponent to play any important artifact or enchantment
Targeted removal like Bojuka Bog and Soul-Guide Lantern hit one player without committing a card slot to a permanent
It's been mentioned in conjunction with Grist, the Hunger Tide, which, when exiled with the Cauldron, turns all of your creatures with +1/+1 counters into pseudo-Planeswalkers with Grist's loyalty abilities
Ashiok, Dream Render This high up the list, you know that any of the more straightforward self-mill spells are grading out among the best value for mana you can get