Heres how Id rate the 10 to start: Tier 1 Archetypes (best decks) UR Big Spells BG Graveyard/Midrange Tier 2 Archetypes (good) Tier 3 Archetypes (decent) UB Control/Good Stuff GW Go Wide/Midrange BR Wizards/Bleeder RG Landfall/Stompy The main delineation between these archetypes is the level of synergy and support they have
Blue, much like Red, has the potential to be incredibly versatile
If you still want a third source of trample for some reason then Zegana, Utopian Speaker is fine
A: GY stands for Green/Yellow, the two ink colors of the OP10-022 Trafalgar Law deck
That said, signets are still mostly fine, and playable alongside them if you really need extra rocks
If you ask some fellow players they might point you to Cycle of Renewal, Sakura-Tribe Elder, and Sabotender