Lightning Runner
e5d9c7eb-dca4-4471-a91f-a5aad3a69c2f
$1.00 CND
Double strike, haste
Whenever Lightning Runner attacks, you get {E}{E} (two energy counters), then you may pay {E}{E}{E}{E}{E}{E}{E}{E}. If you pay, untap all creatures you control, and after this phase, there is an additional combat phase.