0: Until end of turn, Gideon becomes a 4/4 Human Soldier creature with indestructible thats still a planeswalker
The first is that you can only sensibly use Channel to play colourless cards limiting you to Eldrazi, Colossus and potentially some of the 6 and 7 mana artifact dorks
I personally chose Violent Outburst over Shardless Agent for this spot, as the former is the only one you can cast at instant speed in the entire format
Transmute Transmute, the Dimir mechanic from the original Ravnica block, allows you to discard the card to tutor for a card with the same converted mana cost
I also had a water energy card in my hand, and so I defiantly decided to give that to Seaking instead
The Prepare mechanic will give players access to some of Magic 's most powerful Instants and Sorceries, including the new Emeritus of Ideation, allowing players to cast Ancestral Recall, a member of the game's "power nine" cards