The singleton Drownyard Temple isnt great here because you dont have that many uses for extra mana, but I think theres a lot of value to the first one
Arahbo, Roar of the World, gives a target Cat +3/+3 at the beginning of combat, meaning by turn two, with creatures like Sacred Cat and Loam Lion, you'll be able to attack your opponents with a 4/4
Time Vault is an incredibly cheap two-mana artifact that you can tap to take an extra turn
Too often Id have a Thing in the Ice unable to transform on an important timetable
I prefer controlled smashing, and best associate with the Temur colors
Examples of Core Set 2020 signposts include Corpse Knight, Empyrean Eagle, Creeping Trailblazer, Risen Reef, and Moldervine Reclamation