- Charms (More likely than Commands in my opinion, and if I had to guess it could possibly be like a DFC uncommon that has 2 abilities of a color on one side, and 2 abilities of another color on the opposite).
- Commands (Less likely than Charms due to the rarity restriction, but still possible).
- Housemages? (Similar to Guildmages, maybe just represented by like common teachers or students)
- Probably some kind of Signet or House symbol artifact
- Familiars based on each House?
- A House leader; i.e. an Archmage.
I could see them making Commands like the kicker ones from Zendikar rising, however over costed they are and easily forgettable. I think as far as signet go they could easily reprint the talismans from modern horizons instead of making a whole new card cycle (although the Mirrodincycle need the reprint more IMO). The house leader idea would ba an easy in for them to introduce new legends or the obligatory planeswalker.
I could see them making Commands like the kicker ones from Zendikar rising, however over costed they are and easily forgettable. I think as far as signet go they could easily reprint the talismans from modern horizons instead of making a whole new card cycle (although the Mirrodin cycle need the reprint more IMO). The house leader idea would ba an easy in for them to introduce new legends or the obligatory planeswalker.
(W/U)(B/R)GForm of Progenitus, Shape of a Scrubland
BRGJund Tokens with Prossh, the Magic Dragon Foil
URGAnimar, the RUG CleanerFoil
RRRFeldon of the Third Path 2.0 Foil
BG(B/G)Not Another Meren DeckFoil
UR(U/R)Mizzix, Y Control and X Burn Spells
(W/U)(B/R)GHarold Ramos - The 35 Foot Long Twinkie (In +1/+1 counters)
UB(U/B)Dragonlord Silumgar