Gift of the Viper

The untap clause is the tell. Most tricks that grant deathtouch and reach are defensive: you cast them on a blocker to trade up. This one is written to work from the other side of combat. Cast it on your attacker after blocks resolve and the untap turns that creature back into a defender for the crackback, while the deathtouch counter makes it a permanent one-for-one threat against anything that walks into it afterward. That untap is the piece that separates it from every other one-mana green pump spell, which spend their mana and leave: this one converts an attacker into a blocker on the same swing. The three counters do the rest of the work. A conventional trick spends a card to win one combat; these stay on the creature. The +1/+1 is the smallest piece; the reach and deathtouch counters are the durable ones, converting an ordinary body into a standing air-and-ground deterrent that keeps paying out every turn the creature survives. It reads as a combat trick and prices like one, but the design is closer to a cheap, permanent upgrade you happen to be able to deploy mid-combat: the mana buys not a single blowout but a body that stays dangerous long after the spell has left the stack.