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It makes White Goat not work, Black Goat only work after a non-Nordic is destroyed by battle, and makes all Nordics die to backrow removal too as if they weren't vulnerable enough

Don't worry about Master Hyperion - there's plenty of Agents included to cover its summoning cost

Loxi: It's a good Hydra to add to the existing pool, almost exclusively because it's got a really nice rate (only one extra green pip), great keywords, and provides mana back to a deck that is basically made of mana sinks

Arcanist has seen play in spell-based decks in many eternal Magic formats, and is currently banned in Legacy

If you've not tried him and you have a thirst for the infinite, I couldn't recommend him enough