Planeswalkers did that in a way battles couldnt
Skilled Combatant basically allows Robin Hood to play double duty, gaining Lore while taking out opposing threats
The card is incredibly good at grinding down opponents over many turns while also sustaining your life total, but some decks just provide too much pressure for this strategy to be viable
For this reason, it is the undisputed king of fast mana
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It doesn't see any play in the first two so - as with so many expensive MTG cards - we turn to EDH to track down the cause of this price rise