(Zero is even.) Whenever an opponent casts a spell with mana value of the chosen quality, choose one that hasnt been chosen Put a +1/+1 counter on Gollum
There is much more room here than with simple draw a card, but I am generally not in favor of having pretty much the same text, but with small differences, which can lead to situations, where you make mistakes, because you assumed a card would work in a specific way
You can see how Conjurer's Closet can enable some truly busted things , including combos that can do everything from giving you infinite turns to preventing your opponents from playing any spells
Skyfisher Spider
The deck that I could see wanting to play this is a version of Selesnya Midrange, that splashes blue
Players who are looking to build their specific deck but still love the surprise of opening booster packs will love the Theme Booster