The Deck Builder's Toolkit is designed to let a new player get a lot of cards for not a lot of money
Since he is changing at the same time as a new set is dropping, with really only DLC Toronto being the current format without Bucky, it would be premature to assume that certain decks that are held in check by Bucky will just dominate a metagame with a whole new set added to it
There are so many +1/+1 counter synergies these days that its incredibly easy to make an oppressively powerful deck with that strategy, and I personally dont like the mental energy required to keep track of all the various triggers those strategies accumulate on the battlefield
The something here can be most anything we so far have cards that craft with artifact, cave, various creature types, nonland permanents with activated abilities, and just straight up cards in general
MANA DRAIN Counterspells are dime-a-dozen in blue, so while they are in many ways replacement level, there are some that stand above the rest and make it into this list