This is just released, but it's made for this archetype all up and down the block
Your last attack ability on it might not do what you want either - because that mana is gained in the damage step, you'll only be able to cast instants with it, because you'll lose that mana before the 2nd main phase
Players can Shift, and play this card on another Kronk card for a lower cost of 5 Ink, and when this character banishes another character, the player can play a character card with a cost of 5 or less for free
These bundles currently sell for a pretty hefty markup from the traditional bundles typically have an MSRP around $50 each
But I wouldnt recommend including more than 60 cards in your deck
While its rare to get excited about counterspells in Limited, its more important in the Dimir deck to protect encoded creatures and assets