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Unless youre heart is set on this, its going to be difficult to recur your value

It pits you and a legendary creature of your choice against an opponent (or multiple opponents) and a legendary creature of their choice (choices?) Its an epic battle between 100 of your cards and 100 of theirs

What are your opponents playing

Play Rite of Undoing, delving four cards from your graveyard, targeting Qarsi Sadist and Kheru Bloodsucker

For example, Mizzix, with at least four experience counters, allows you to cast and "buyback" Reiterate for only two mana

Valkyrie Aerial Unit has a decent body for its cost, evasion, and helps filter the top: it seems like a good combination to try to create our own version of the archetype in the format