Circle of Protection: Blue [Limited Edition Alpha] Dark Ascension Promos you may pay {0} rather

you may pay {0} rather than pay this spell's mana cost

Set: Modern Masters Type: Instant Rare Cost: {W} Split second (As long as this spell is on the stack

Set: Kaladesh Inventions Type: Artifact Creature — Construct Mythic Cost: {3}{G}{G} Trample When Verdurous Gearhulk enters the battlefield

" —Rene Descartes

but my host would casually push it down before I could make out what it was

Circle of Protection: Blue [Limited Edition Alpha] Dark Ascension Promos you may pay {0} ratherSet: Limited Edition Alpha Type: Enchantment Common Cost: {1}{W} {1}: The next time a blue source of your choice would deal damage to you this turn, prevent that damage.