all regigigas pokemon cards - 84/111 - Crimson Invasion if you have Regirock Regigigas (37/146) [Diamond & Pearl:

While all this support makes Nikya of the Old Ways decks surprisingly resilient, the top end is naturally the best bit

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It is never really the threat used post Upheaval that won the game and that is why Upheaval makes this list

Alternatively, pack in a suite of second and third card draw payoffs like Morska, Undersea Sleuth

You can use your mana however you choose as long as you meet the casting cost requirements for each card