Good idea to collect opinions before the banlist changes.
Blood Moon / Back to Basics: Don't ban the non-basic hate enchantments. Rather remove them from the watchlist all together. Because right now, there is no point in even considering a ban of them; multi-colour will run wild if they are gone and then there is really no good reason left to stick with one or two colour decks. Our format needs them right now to stay healthy. If you really want to ban them, consider banning fetchlands in the same cycle, too.
Demonic Tutor/Dig Through Time/Treasure Cruise/Mana Drain: Don't ban them either. They are basically the core of each controlish decklist in this format. Yes, they all offer strong effects and some of them (especially Dig Through Time and Demonic Tutor) enable some busted line of plays in combo decks. But that's more like a problem of combo/combo-control (I'd count Reanimator as such) decks being pretty strong with the previous unbannings (see below). The pure control archetype will fall out of the meta without them.
Imperial Seal/Entomb: That's what pushed combo/combo-control to Tier 1 status. Not like this was bad in general, but you have to consider archetype specific bans first if they prove to be too strong in the future - and that before you think about removing the good stuff the typical combo colours blue and black offer (see above).
Academy/Oath: Totally banworthy by sheer power level. Not sure if necessary, though. Don't have too much experience playing with/against them.
Gifts: Probably too strong right now because there is so much combo potential to abuse it with. While in the past it was used to set up slow CA enginges (Life from the Loam or the Regrowth / Witness + X + Y package) or slow combos (Academy Ruins + Crucible of Worlds + Thopter Foundry combo), it would currently result in a pretty fast combo win, probably the turn after resolving it EOT. Generally speaking, 4 CMC is a lot for today's game of magic that got really fast. If you can prevent it getting abused, this would be a nice addition to slower decks and especially the ones only splashing blue.
Mystical Tutor: The ban was heavily discussed for good reason. It was at a time Izzet ran wild. It also hit combo decks, but they got more than a replacement in form of Imperial Seal. I'm unsure about it, but is probably better banned for another 6 months until we know how the metagame adapts to the big combo potential right now.
Blood Moon / Back to Basics: Don't ban the non-basic hate enchantments. Rather remove them from the watchlist all together. Because right now, there is no point in even considering a ban of them; multi-colour will run wild if they are gone and then there is really no good reason left to stick with one or two colour decks. Our format needs them right now to stay healthy. If you really want to ban them, consider banning fetchlands in the same cycle, too.
Demonic Tutor/Dig Through Time/Treasure Cruise/Mana Drain: Don't ban them either. They are basically the core of each controlish decklist in this format. Yes, they all offer strong effects and some of them (especially Dig Through Time and Demonic Tutor) enable some busted line of plays in combo decks. But that's more like a problem of combo/combo-control (I'd count Reanimator as such) decks being pretty strong with the previous unbannings (see below). The pure control archetype will fall out of the meta without them.
Imperial Seal/Entomb: That's what pushed combo/combo-control to Tier 1 status. Not like this was bad in general, but you have to consider archetype specific bans first if they prove to be too strong in the future - and that before you think about removing the good stuff the typical combo colours blue and black offer (see above).
Academy/Oath: Totally banworthy by sheer power level. Not sure if necessary, though. Don't have too much experience playing with/against them.
Gifts: Probably too strong right now because there is so much combo potential to abuse it with. While in the past it was used to set up slow CA enginges (Life from the Loam or the Regrowth / Witness + X + Y package) or slow combos (Academy Ruins + Crucible of Worlds + Thopter Foundry combo), it would currently result in a pretty fast combo win, probably the turn after resolving it EOT. Generally speaking, 4 CMC is a lot for today's game of magic that got really fast. If you can prevent it getting abused, this would be a nice addition to slower decks and especially the ones only splashing blue.
Mystical Tutor: The ban was heavily discussed for good reason. It was at a time Izzet ran wild. It also hit combo decks, but they got more than a replacement in form of Imperial Seal. I'm unsure about it, but is probably better banned for another 6 months until we know how the metagame adapts to the big combo potential right now.