Refunding 2 mana in the form of Treasures is great, since those Treasures can help cast the cards you exile on that very same turn
Jean-Emmanuel "JiRock" Depraz has been playing Magic for years, bursting onto the scene with a 1st-place finish at Grand Prix Warsaw in 2017
Based on the latest market prices tracked on TCG Stacked, Mind Flayer is worth about $0.46 USD for a regular copy and $0.51 USD for a foil copy
In the current Standard format there arent many enchantment targets, but there are some powerful ones you will want to use them against
Also new in Commander Legends are monocolour partners

Gallery and List of Toxic Cards Creatures With Toxic Annex Sentry Basilica Shepherd Bilious Skulldweller Blightbelly Rat Bloated Contaminator Bloodroot Apothecary Branchblight Stalker Contaminant Grafter Crawling Chorus Duelist of Deep Faith Dune Mover Flensing Raptor Glissa's Retriever Ichorspit Basilisk Indoctrination Attendant Ixhel, Scion of Atraxa Jawbone Duelist Karumonix, the Rat King Mite Overseer Monument to Perfection Myr Convert Necrogen Rotpriest Nimraiser Paladin Paladin of Predation Pestilent Syphoner Plague Nurse Porcelain Zealot Ribskiff Sheoldred's Headcleaver Skrelv, Defector Mite Slaughter Singer Stinging Hivemaster Tainted Observer Tyrranax Atrocity Tyrranax Rex Unctus's Retrofitter Venerated Rotpriest Venomous Brutalizer Venser, Corpse Puppet Vishgraz, the Doomhive Voidwing Hybrid Cards that Grant Toxic Toxic Matters Cards These cards don't necessarily have or grant toxic, but mention the mechanic by name in one way or another