Even if I think this 4-mana sorcery speed spell isnt great, I cant let it go, and I feel it should be at least mentioned here
Speed skirts my rule about not wanting to track things in the game, but there are few ways to lose speed and youre only tracking your own
Weve picked out the most expensive cards in the Lost Caverns of Ixalan set, so youll know which pulls to get excited about and weigh up whether to keep, trade, or sell your best finds

Abundant Countryside Amoeboid Changeling Avian Changeling Barkform Harvester Belonging Birthing Boughs Black Market Connections Blades of Velis Vel Bloodline Pretender Cairn Wanderer Chameleon Colossus Changeling Berserker Changeling Hero Changeling Outcast Changeling Sentinel Changeling Titan Changeling Wayfinder Chitinous Graspling Chomping Changeling Crib Swap Ego Erasure Faceless Agent Feisty Spikeling Firdoch Core Fire-Belly Changeling Flock Impostor Formless Genesis Game-Trail Changeling Gangly Stompling Ghostly Changeling Gladewalker Ritualist Graveshifter Guardian Gladewalker Impostor of the Sixth Pride Irregular Cohort Littjara Littjara Glade-Warden Littjara Kinseekers Masked Vandal Maskwood Nexus Mirror Entity Mischievous Sneakling Mistwalker Moonglove Changeling Moritte of the Frost Morophon, the Boundless Mothdust Changeling Mutable Explorer Nameless Inversion Oddric, Lunar Marquis (playtest) Omni-Changeling Omnipresent Impostor (playtest) Orvar, the All-Form Personify Prideful Feastling Realmwalker Rooftop Percher Shapesharer Shields of Velis Vel Sizzling Changeling Skeletal Changeling Springleaf Parade Stalactite Dagger Taurean Mauler The Bears of Littjara Three Tree Mascot Turtleshell Changeling Universal Automaton Unsettled Mariner Valiant Changeling Venomous Changeling War-Spike Changeling

Thats usually a downside, but it also deals damage to that opponent thanks to Sheoldred, the Apocalypse
The ability to cast Zombies out of the graveyard was limited to once per turn as it proved to be a little too efficient