(Enchanted creature is 1/1.) You may target a creature that is already tapped with Croaking Curse
Honorable Mentions: Altered Ego, Angel of Jubilation, Anguished Unmaking, Archangel Avacyn, Avacyns Pilgrim, Ghost Quarter, Grafdiggers Cage, Gavony Township, Mentor of the Meek, Parallel Lives, Primal Surge, Rooftop Storm, Snapcaster Mage
While not guaranteed, Heralds Horn is a great way to get a free draw multiple times in a game
Each discover is a dramatic reveal that can cascade into exactly the spell you need or another Dinosaur that triggers again next turn
Chords an instant, Invasion flips into Zilortha, Apex of Ikoria, Zeniths the cheapest, and Finale (arguably Magic's best green sorcery) has a flashy wincon mode
Reading MaRos comments over the weekend, I still agree with him that the playtest cards are problematic