WAVEBREAK HIPPOCAMP Tempo/flash decks may not need green anymore given all the blue options that Wizards has offered us in Theros
Id suggest throwing it in your Tyranitar Toolbox with Weavile and gratuitous amounts of Seeker and Super Scoop Up
Snarling Gorehound Staple the basics of that ability onto an easy-to-reanimate creature in black, and youve got Snarling Gorehound, which is finding its way into tons of EDH decks and lives happily in those Insidious Roots builds in Standard
Gisela is a flying beater that rapidly deals damage while halving return fire, and Progenitus is an incredible 10/10 Hydra Avatar that literally has protection from everything, allowing it to attack with no fear of blockers
Its not game-breaking and far from a staple
Glimpse the Unthinkable was a better card in the past, but it can still put in some good work, even though it's a one-off mill for ten