Lightning Runner [Modern Horizons 3 Commander] Puzzle Solving but not for the skill

but not for the skill to wield it

Set: Legions Type: Creature — Sliver Rarity: Rare Cost: {3}{R} All Slivers have "{T}: Target Sliver creature gets +X/+0 until end of turn

Set: Secret Lair Drop Series Type: Legendary Creature — Dragon Rarity: Rare Cost: {4}{R}{R} Flying

Water Elementals shift without warning from tranquility to tempest

Lightning Runner [Modern Horizons 3 Commander] Puzzle Solving but not for the skillSet: Modern Horizons 3 Commander Type: Creature Human Warrior Rarity: Mythic Cost: {3}{R}{R} 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. Catch me if you can.