Whir of Invention [Mystery Booster]

Whir of Invention [Mystery Booster]Set: Mystery Booster 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: EX: Legend Maker Type: Metal Rarity: Uncommon Retreat cost: Colorless

it costs {8} more to cast this way

Set: Innistrad: Double Feature Type: Enchantment — Aura Rarity: Common Cost: {R} Enchant creature

000 Type: Creature — Tyranid Rarity: Rare Cost: {X}{1}{G} Ravenous (This creature enters the battlefield with X +1/+1 counters on it

Set: Team Rocket 1st Edition Type: Lightning Rarity: Rare Retreat cost: Colorless

Each new generation of slivers evolves to assimilate the strengths of the prey upon which their progenitors fed

shuffle your graveyard into your library

As if anyone needed another reason to avoid dark

Discard a card: Exile the top card of your library

When Nurturing Presence enters the battlefield

Riveteers welder

Set: EX: Legend Maker Type: Water Rarity: Common Retreat cost: Colorless