Spell Blast [Tempest] Deckmasters Diet does the rest

Diet does the rest

Set: Phyrexia: All Will Be One Tokens Type: Emblem Rarity: Common Whenever a Mountain enters the battlefield under your control

Chainer's madness personified

Set: Kaladesh Prerelease Promos Type: Sorcery Rarity: Rare Cost: {3}{R} Reveal cards from the top of your library until you reveal an artifact card

if this came under your control since the beginning of your last upkeep

Spell Blast [Tempest] Deckmasters Diet does the restSet: Tempest Type: Instant Rarity: Common Cost: {X}{U} Counter target spell with mana value X. (For example, if that spell's mana cost is {3}{U}{U}, X is 5.) Call it the thinking mage's version of brute force.