When coupled with some discard and great multiplayer effects and red and black actually end up bringing quite a bit to the group game
The first place I look is my LGS
Tidus, Blitzball Star gets stronger as you create more artifact tokens, while Cid, Timeless Artificer supports a wide battlefield of artifact creatures
Blatant Thievery What an appropriately named card
Whispers of the Muse (T1, Ext, S, Block) A favorite in "Turbo Xerox" (a blue deck which used minimal land but a ton of cantrips to thin out the deck), Counter-Phoenix (Shard Phoenix + Forbid) and Tradewind-Awakening (put Awakening on the stack, tap all your lands for mana, untap all your lands), Whispers has what might seem like a hefty price to pay for one card but you get to do it turn after turn after turn
Overall, it should see play in casual and commander formats, especially if you can leverage its unique mechanics effectively