This can only be done during your turn, and only once per turn
The 2001 film struggled at the box office but became a cult favorite, in part due its distinctive visual design developed by acclaimed comics artist Mike Mignola
So you can either gain more control by drawing cards from your deck, or you can deal a free two damage on any other character in play
So how to you represent something that you have to kill over time in Magic
$25 Upgrade +1/+1 Counters is a very deep archetype so there's more sweet upgrade options that I could ever hope to cover, but I selected some of my favorites: for protection I've added Bulwark Ox and Mutational Advantage, a bunch of proliferates with Metastatic Evangel and Dreamtide Whale being the two best, ramp got a massive upgrade with Astral Cornucopia / Kami of Whispered Hopes / Purestrain Genestealer / Summon: Fenrir, and so on
These decks are usually not massively complicated, and tend to have some synergy built into them from the ground up