Many such cards like Entomb and Chrome Mox got their ticket to Arena through a Limited event, or Arena Anthology, or show up very infrequently like a Special Guest that earn a pre-ban so as to not shake up any pre-existing legality
Warrior's Oath looks good, but since it can't be searched by Sunforger, you're better off with ramp
This means high-value Navy characters that usually demand steep hand costs to trigger their K.O
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attaches it to a 2/2 red Rebel
As u/arlondiluthel points out, players should always refer to Oracle text when theres a discrepancy between printings. In theory, this should solve any issues before they get out of hand, however, as u/Nvenom8 notes, its not that simple