He could attack, block, had evasion, couldn't be killed, and after the Sixth Edition rules changes could attack, kill and live, and block, kill and live
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Its an instant, so at end of turn of the player to your right, you can create a deadly army nearly out of nowhere
For that reason, it feels logical to look at Even the Score as an almost modal spell that can be cast late with a big , but also has value in games when you cant afford to dedicate an entire turn to drawing
A lot of decks can't win without making dorks and so Oath is rather oppressive against them
Broadly speaking, Magic cards break down into one of two categories, permanents and non-permanents