Lions Eye Diamond gets very little buzz in the MTG finance community, but the Reserve List card has been a Legacy staple for years
The rate isn't bad for what you get, either, and the Great Train Heist will be useful at every stage of a game, whether you're using it for an early mana advantage, as a combat trick (offensively or defensively), or as a source of extra damage to close out a game
If you need more lands, look for Sword of the Animist
Barkform Harvester Chameleon, Master of Disguise Changeling Wayfinder Chitinous Graspling Chomping Changeling Crib Swap Feisty Spikeling Firdoch Core Flock Impostor Gangly Stompling Graveshifter Koh, the Face Stealer Lazav, Familiar Stranger Lazav, Wearer of Faces Likeness Looter Mischievous Sneakling Mutable Explorer Naga Fleshcrafter Nameless Inversion Omni-Changeling Prideful Feastling Rooftop Percher Sizzling Changeling Super-Skrull Taurean Mauler Three Tree Mascot Undercover Skrull Vazin, Two-Faced Trickster Visage Bandit Waxen Shapethief
Few things say control like taking a player's creature and beating them with it
You cant play a Stage 1 card unless you have its Basic form in play, following the natural evolution chain of that Pokmon