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As much as Islandcycling is a nice mana fixing upside, it hardly justifies this cards immense cost

These are your game-winners

Spirit Squadron (in White and Blue) unsurprisingly leads with multiple Spirit creatures, and is led by the seven-cost 'Spirit Soldier' Millicent, Restless Revenant , whose main effect is to spawn a 1/1 Spirit creature token every time one of your other (nontoken) Spirits does damage, or dies

Your 4 mana nets you everything and a kitchen sink 4/4 and four massive abilities

This will certainly boost the power of the deck, just not to the same level that you can upgrade others (like Timeless Wisdom)

Dragon Fire I hate to say it, but the inclusion of good 'ol Dragon Fire in this decklist takes it up a full tier on the power chart