Sure they will keep their Sylvan Caryatid, but it will kill their giant monster that they are trying to beat you with
Use these protective sleeves on the following games: A Fool's Fortune, Apotheca, Assassincon, Blood Bound, Blue Moon, Century: Spice Road, Citadels (2016 Edition), Compounded, Coup (Brazilian Variant), Dawn Of The Zeds (Third Edition), Dreamwell, Eight Epics, Elder Sign, Fate Of The Elder Gods, Generalship, Goblins Drool Fairies Rule!, Grifters, Hobbit Tales From The Green Dragon Inn, Imperial Harvest , Infiltration, Kashgar: Hndler Der Seidenstrae, Lord Of The Rings: Confrontation, Love Letter Premium, Lucidity: Six-Sided Nightmares, Mansions Of Madness: Second Edition, Moonquake Escape, Mystic Vale, Onitama, Pandante, Pocket Madness , Power Play: Schemes & Skulduggery, Runebound (Third Edition), Sail To India (AEG Edition), Saloon Tycoon, Scot Pilgrim's Precious Little Card Game, Strife: Shadows And Steam, Tower Of London, V-Commandos, War Of The Ring
This is the Field Spell that allows him to play all his Toon Monsters while also protecting them from targeting effects and destruction
Those are all useless
That's just a nasty level of broken if you do, quite easy with Nykthos or mana rocks and such which you can untap too
You start at 20 life, which makes it comparable to Vintage