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Its going to be $10, like Jadelight Ranger was) Sell six months before rotation: Carnage Tyrant, History of Benalia Buy when it rotates and is cheapest: Mox Amber (going to get broken at some point, already ticking up in Commander), The Immortal Sun

All of these are very much versions you can find easily, and for very cheap if your deck wants a Phyrexian Arena

Try to have as many cards of the same mana as you can, to allow faster access to spells and creatures

People draw enough cards these days that they should never always be dead to Farewell

You get premade decks that are genuinely quite playable, interesting and fun