The first was double-faced cards (DFCs) that were a cross between modal and transforming
Is this the Solemn Simulacrum of this set
Incapsula incident ID: 679000170039686231-19264019288753227
You can activate Arcum for Sewer Cam, untap him, Arcum for Repurposing Bay, sac the Cam to get Corridor Monitor, untap Arcum and hold priority to sac the Monitor for Encroaching Mycosynth, and now you can even sac Arcum to himself to get Mind Over Matter, and use Repurposing Bay to get The One Ring, and now you can fire off the MoM + TOR combo you mention
In fact, Katara alone may have been enough to make Harabaz Druid spike, even though she doesn't synergize with it specifically, but fans are likely also banking on there being all kinds of other cool allies in this set - which seems like a pretty safe bet
Sinkhole Mind Twist Armageddon Balance Wheel of Fortune Time Twister Dark Ritual Winter Orb Berserk Channel Ankh of Mishra Bazaar of Bagdad Animate Dead Before jumping into this top ten we have one final list of cards that includes everything else from this magnificent year of MtG that is still relevant in cube in some way or another