Lethal Scheme

Convoke on a removal spell is the design problem here: it lets a black kill spell get cast for a fraction of its printed cost by tapping bodies you already control, and it deliberately routes that discount through the same creatures that then get paid off. Each convoker connives as the spell resolves, folded into the oracle text rather than hung as a delayed trigger, so the sequencing matters in a way most removal never asks about: the more creatures you commit to casting it, the more card selection and +1/+1 counters you bank on the way out. That turns a four-mana instant into a tempo engine that scales with a wide board, rewarding a deck with spare attackers standing around rather than a control shell staring at an empty battlefield. The tension is genuine, since discount and payoff both want a full board, but tapping those creatures to convoke means they are not swinging or holding back on defense the turn you fire it off. Unconditional destruction that hits creatures and planeswalkers is already premium at instant speed; stapling connive to the convoke cost is what gives a go-wide black deck a removal option that feeds its own card advantage instead of costing it, folding the tempo hit of paying with bodies into forward motion the following turn.