Legendary horrors, nightmares, demons, and spirits are a good place to start, followed by anything from Magic sets that take place on planes like Innistrad and Duskmourn
These are 50% more expensive on CK, which also only wants $20 for the Constellation version
Mystic Remora [Best Early-Game Draw MTG Commander Staple] Mystic Remora provides explosive early-game card advantage at the cost of one blue mana
Adding 2 mana in a combination of colors enables lots of multicolor cards like Omnath, Locus of All, and Niv-Mizzet Reborn which would be far harder to use otherwise
During each players untap step, before the active player untaps permanents, all phased-in permanents with phasing that player controls phase out. Simultaneously, all phased-out permanents that had phased out under that players control phase in. The untap step begins All phased-in permanents with phasing that the active player controls phase out, and all phased-out permanents that the active player controlled when they phased out phase in
some cards, like Entomb, put a card directly into your graveyard
