Creature — Cat
When Aetherstream Leopard enters the battlefield, you get (an energy counter)*.
Whenever Aetherstream Leopard attacks, you may pay . If you do, it gets +2/+0 until end of turn.
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Aetherstream Leopard Discussion
1 week ago
Aetherstream Leopard can only activate it's ability one time at combat, not unlimited times or it will be followed by a colon. See below.
Aetherwind Basker has the effect you're looking for.
2 weeks ago
Double strike will not give you extra energy with Lightning Runner or Aetherwind Basker attack ability. Double strike does not mean that the creature attacks twice, only that it deals first strike and normal strike damage.
4 Aetherwind Basker and 4 Lightning Runner is a bit too much for such high costing cards. By time you cast them you're probably close to dead. They want you to have multiple creatures out, of which you don't have many.
I'd suggest trying some of these: Longtusk Cub, Sage of Shaila's Claim, Voltaic Brawler, Aetherstream Leopard, Aether Herder, and Bristling Hydra. They are some lower costing creatures that can give you energy or hit hard.
Nissa, Nature's Artisan wouldn't be a bad card to put in either. Keep in mind you want more lower cost spells than higher so you can cast more things.
Hope that helps.