Mewtwo makes a guest appearance alongside the inspiration for its creation, Mew, as the pair's shared entry is one of the most valuable Mewtwo cards
We've also seen variants that downplay the sleep for more versatility, bringing in Magikarp and Mega Gyarados ex for greater power
Those are not artifacts from a discontinued program
Though its modest +1 only puts one +1/+1 counter on target creature, its -3 provides a creature with both evasion and a sizable offensive boost by providing both flying and double strike until the end of the turn
Or you might draw on the WBG combos that let ramp your way into a few huge creatures, like Looming Altisaur, or Indomitable Ancients. Or you can mingle those strategies: perhaps you summon a Watchful Radstag early game, which both grows bigger and spits out token copies as you pop out mid-range creatures, then pimp out those tokens with a Canopy Gargantuan and keep Scour the Desert in hand to flood the board with a token army if all else fails