Knuckles The Echidna

At the start of your turn, you may pay {1} to set
an extra power card for the turn.
[Once per turn]: When you activate a power card
with "Emerald" in its name, [Draw 1].
[Once per turn]: When a unit you control with "Guardian" in their traits attacks, you may pay {2} to give it +2/+0 until the end of
the turn.
[Activate {3}]