Older Card Sets

Plastic

I thought it would be cool if you guys would release a small handful of cards from older sets on a more regular basis so that players had something new to play for more often.

Example: Every 3 weeks release 1-2 (or whatever amount you want) of cards from an old set. Then put the sets on a rotation.

So:
Nov 1-21 we might see 3 Mirage cards available by whatever means you make them accessible.
Nov 22-Dec 12 we'd get a chance to earn some Tempest cards.

Why not make them cost a lot of runes, since a lot of players have so many they're sitting on. Or give an option to use runes OR crystals. Just throwing out ideas.