Origins Main Set OGN-021/298 uncommon Official FAQ
Sun Disc
Card Text & Abilities
[T]: [Legion] — The next unit you play this turn enters ready. (Get the effect if you've played another card this turn.)
Official Rules FAQ & Clarifications
1 Official FAQ Q:
Can I use Sun Disc’s ability the turn I play it, counting itself for its Legion ability?
A:
Yes. Although Legion normally requires “another” card for spells and play effects, Sun Disc’s activated ability is not Sun Disc. On subsequent turns, you’ll need to play another card to turn on Legion.
Source: Official FAQ: Origins FAQ →