The most giving of these is probably Font of Mythosyoure spending four mana to let everyone else around the table draw two extra cards before you finally get a chance to draw
Stellar product all around
Artifact Creature: Esper SentinelEsper Sentinel, 425447 Inclusions Artifact Land: Seat of the SynodSeat of the Synod, 144694 Enchantment Creature: Sanctum WeaverSanctum Weaver, 116227 Enchantment Artifact: Whip of ErebosWhip of Erebos, 76481 Kindred Enchantment: Eldrazi ConscriptionEldrazi Conscription, 46704 Kindred Instant: Crib SwapCrib Swap, 35661 Kindred Sorcery: Elvish PromenadeElvish Promenade, 28369 Instant Sorcery: Repudiate // ReplicateRepudiate // Replicate, 11268 Kindred Artifact: Cloak and DaggerCloak and Dagger, 7377 Enchantment Land: Valgavoth's LairValgavoth's Lair, 2842 Yeah, yeah, yeah, Esper SentinelEsper Sentinel is an amazing card that every deck should play
Cheating the command tax is something I hope we never see again, but a commander who actually wants to get into the red zone is probably the best place for it
The double strike can also let Rogue creatures like Grim Hireling trigger their ability twice
It doesnt feel right to give black slots to these mostly colorless cards, but it also doesnt feel right to exclude these cards from a lot of Cubes