The idea is to represent mutation or adaptation through +1/+1 counters, though weve seen it used in other contexts outside the Simic Combine on Ravnica
It hard stops any kind of spell and turns it into mana for your next main phase
Shagrat, Loot Bearer from The Lord of the Rings: Tales of Middle-earth Details Shagrat, Loot Bearer is a rare in the set The Lord of the Rings: Tales of Middle-earth.
Lessons allow you to earthbend 1 and add an additional counter, and all of this synergizes with additional +1/+1 counter cards

Abundance Agent's Toolkit Alhammarret's Archive Alms Collector Archmage Ascension Artist's Talent Asmodeus the Archfiend Bard, King of Dale Blood Scrivener Case of the Pilfered Proof Dakmor Salvage Dark Dabbling Darkblast Enduring Renewal Eruth, Tormented Prophet Family's Favor Fasting First-Sphere Gargantua Fisher's Talent Flotsam // Jetsam Forbidden Crypt Golgari Brownscale Golgari Grave-Troll Golgari Thug Grave-Shell Scarab Greater Mossdog Heroic Sacrifice High Score Hullbreacher Immortal Coil Island Sanctuary Izzet Generatorium Jace, Wielder of Mysteries Jaya Ballard Laboratory Maniac Lashknife Barrier Leader, Super-Genius Lich Life from the Loam Living Conundrum Mangara's Tome Meat Locker // Drowned Diner Moldervine Cloak Necrodominance Necroplasm Nemata, Primeval Warden Nightmare Void Notion Thief Obstinate Familiar Ormos, Archive Keeper Out of the Tombs Ozolith, the Shattered Spire Parallel Thoughts Peregrin Took Personal Decoy (playtest) Phial of Galadriel Plagiarize Pursuit of Knowledge Quantum Riddler Ral's Vanguard (playtest) Retriever Phoenix Rigo, Streetwise Mentor Rime Chill Sages of the Anima Scrapwork Mutt Scrapwork Rager Shambling Shell Sharae of Numbing Depths Shenanigans
