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R Rare Ursarctic Megabilis X WATER Level 8 [ Beast-WarriorTunerEffect ] ATK 2800 DEF 700 During the Main Phase (Quick Effect): You can Tribute 1 other Level 7 or higher monster from your hand

Banish all "The Planet" cards from your GY, then destroy up to 20 cards in your opponents deck and if you do, half the ATK of your opponents monsters and if your opponent summons monsters, half the ATK of the summoned monsters (These effects last for the rest of this duel)

(Note that color very much does matter.) That spell can then be cast as though it was the chosen card

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I play enough and do well enough to regularly hit a constructed rank in Platinum by the end of each season, so I can offer you some tips I use to climb that ladder