pokemon sun & moon cosmic eclipse booster box - Pokemon: Sun & Moon -

Not only does this tie up their mana each turn, but when they can't pay it anymore, they lose 20 life

It gets even better if you build around it by playing spells you especially want to copy, but assuming you are in the right colors, Dualcaster Mage is the first card I'd put in every Naban, Dean of Initiation Commander deck I build

In white or really any other colour I think this would have done far more work in cube

But more on that later

Spirit Sister's Call is a fine recursion option if you have a bunch of extra permanents like creature tokens, but this deck doesn't include many options to enable it

Fits standard size 12 Booster Pack English MTG Collector Booster Boxes