More Magic: The Gathering cards from the presumably-upcoming Hatsune Miku Secret Lair deck have been revealed, with social media posts showing off the new cards from the unannounced precon emerging on June 17
Exponential Growth has a mana value of 2, but if you cast it for X=2 then it will have a mana value of 6 (2+2+1+1) on the stack
Assuming you buy this years advent calendar at TCGPlayer market price, then its certainly worth the money
The more Stamina you want to recover, the more items you'll have to cough up
The second phase is where more complex actions can be taken, and you can do any or all of the following if you choose: Play any number of basic Pokmon from your hand to your bench
Before you swing in for the win, however, its worth sourcing a Trample enabler