Omnivorous Flytrap Ornery Tumblewagg Paradox Zone Patched Plaything Picnic Ruiner Picnic Ruiner Primordial Hydra Quest for Pure Flame Raphael, the Muscle Sage of the Fang Savageborn Hydra Sazh Katzroy Scrapper Champion Scythecat Cub Seismic Tutelage She-Hulk, Attorney-at-Law Sisterhood of Karn Solarion Solidarity of Heroes Study the Classics Sword of Hours Tanazir Quandrix The First Tyrannic War The Millennium Calendar The Thing Turtle Van Urdnan, Dromoka Warrior Visions of Dominance Voracious Hydra Voracious Hydra Vorel of the Hull Clade War Machine, Avenging Arsenal World War Hulk
The Speed Demon The Speed Demon is rock-solid as a 5/5 flying and trample creature for just 5 mana, one that draws you at least a card if it survives until the end of the turn
Its a source of self-mill, a source of graveyard shuffling, even a win condition with enough mana
If you cant (or dont want to), you can scout by taking a card from the currently active run or set and placing it anywhere in their hand either side up
Swiftfoot Boots I dont think everyone would put Swiftfoot Boots at the top of this list, but I cant think of a card that deserves the spot better