Whir of Invention [Aether Revolt Prerelease Promos]Set: Aether Revolt Prerelease Promos Type: Instant Rarity: Rare Cost: {X}{U}{U}{U} Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.) Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle.

Set: Commander 2013 Type: Artifact Rarity: Rare Cost: {3} You may activate abilities of creatures you control as though those creatures had haste

−12: Exile all cards from target player's library

Set: Rivals of Ixalan Prerelease Promos Type: Legendary Creature — Elder Dinosaur Rarity: Rare Cost: {5}{U}{U} This spell can't be countered

Put the rest on the bottom of your library in a random order

• Counter target spell

Set: Beta Edition Type: Instant Rarity: Rare Cost: {2}{U} Tap all lands target player controls and that player loses all unspent mana

and remove it from combat

Set: Revised Edition Type: Sorcery Rarity: Rare Cost: {2}{W}{W} Destroy all creatures

(It can attack and {T} this turn

You may activate the loyalty abilities of planeswalkers you control twice each turn rather than only once

Set: Alpha Edition Type: Creature — Troll Rarity: Uncommon Cost: {2}{R} {R}: Regenerate Uthden Troll

all creatures that opponent controls attack if able