That said, Wizards has been aggressively anti-free spell when it comes to Historic
Phantom Wings and Ghostly Wings include an ejector seat clause which can turn them into reasonably-costed bounce spells
For only two mana Juri can be brought out exceedingly early in the game

Aegis Turtle Ambitious Augmenter Ambling Stormshell Ancient Adamantoise Angler Turtle Archelos, Lagoon Mystic Armored Whirl Turtle Bedrock Tortoise Blossoming Tortoise Calcite Snapper Casey & Raph, Hotheads Cold-Water Snapper Colossal Skyturtle Daring Thunder-Thief Dark Leo & Shredder Definitely Not a Turtle Don & Leo, Problem Solvers Don & Raph, Hard Science Donatello, Gadget Master Donatello, Mutant Mechanic Donatello, Rad Scientist Donatello, Turtle Techie Donatello, Way with Machines Donatello, the Brains Donnie & April, Adorkable Duo Dragon Turtle Fecund Greenshell Giant Tortoise Giant Turtle Gorex, the Tombshell Heroes in a Half Shell Hexbane Tortoise Horned Turtle Jennika, Bad Apple Big Sister Kappa Cannoneer Kappa Tech-Wrecker Kogla and Yidaro Leonardo, Big Brother Leonardo, Cutting Edge Leonardo, Leader in Blue Leonardo, Sewer Samurai Leonardo, Worldly Warrior Leonardo, the Balance Lita, Little Orphan Amphibian Meandering Towershell Metalhead Michelangelo, Game Master Michelangelo, Improviser Michelangelo, Mutant BFF Michelangelo, On the Scene Michelangelo, Weirdness to 11 Michelangelo, the Heart Mikey & Don, Party Planners Mikey & Leo, Chaos & Order Mikey & Mona, Mutant Sitters Mistford River Turtle Phantasmal Shieldback Prehistoric Turtlesaurus Quandrix Cultivator Raph & Leo, Sibling Rivals Raph & Mikey, Troublemakers Raphael, Most Attitude Raphael, Ninja Destroyer Raphael, Tag Team Tough Raphael, Tough Turtle Raphael, the Muscle Raphael, the Nightwatcher Riptide Turtle Sailors' Bane Scuttlegator Shellephant Silburlind Snapper

The trick to making Empty the Pits good in a control deck is finding ways to draw cards or kill your opponents creatures without putting pressure on your own graveyard