Slimy Dualleech

Deathtouch as a combat subsidy is the whole idea here. Most deathtouch grants ride on the small creature that carries them; this hands the keyword out from a durable 2/4 body each attack step, turning a board of cheap creatures into a rotating threat that trades up with anything it touches. The cap on which bodies can be buffed is the leash: the grant only lands on modest attackers, so you cannot bolt deathtouch onto a haymaker and swing for one-sided lethal removal. Instead it rewards a wide, low-curve board, where every turn a different one-drop or token becomes the creature nobody wants to block. The +1/+0 is almost incidental, a nudge to push a 1/1 into 2/1 range; the deathtouch is what reshapes the math, forcing the opponent to spend a real blocker to eat a chump and letting a token trade up into their best creature. Because the effect triggers automatically as your combat begins rather than costing an activation, there is no mana tax and no telegraph beyond the creature's presence: as long as a legal attacker sits on the board, every combat forces the opponent to solve the same puzzle of which small body suddenly bites. Creatures that let cheap attackers punch above their size are old ground, but the recurring, targetable nature of this grant makes it a standing tax on the opposing blocks rather than a one-time trick.