gruul cards mtg Keyrune [Gatecrash] Art by Tim Hildebrandt. MTG Cube: Top 10 Gruul

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Spells like Transpose capture the abilities of specific jobs (in this case, the black mage's transpose ability) and uses the mechanic rebound to cast it again (the ability's cooldown)

It's up to players how much mana they want to spend for X

1 Gale, Waterdeep Prodigy

You can remove any number of +1/+1 counters across all artifacts you control to add that much mana to your mana pool, and then Jetfire, Ingenious Scientist transforms

But as a card most at home in the sideboard, Negates mana efficiency is perfect for combo or control match-ups when you need additional stack interaction, and when noncreature spells are exactly what you want to answer