Sky Striker Mobilize - Linkage!

Per-phrase breakdown

• If you control no monsters in your Main Monster Zone: You cannot Special Summon from the Extra Deck for the rest of this turn after this card resolves, except "Sky Striker Ace" monsters, also send 1 other card you control to the GY, and if you do, Special Summon 1 "Sky Striker Ace" monster from your Extra Deck to the Extra Monster Zone, and if you have at least 1 LIGHT and 1 DARK "Sky Striker Ace" monsters on your field and/or in your GY, the Summoned monster gains 1000 ATK. (Effect)

Judge-facing facts

• Cannot be activated during the Damage Step.
• Can be activated if you control a monster in the Extra Monster Zone, provided you control no monsters in your Main Monster Zone.
• If you control a monster in the Extra Monster Zone at resolution, you must choose that monster as the card to send to the GY to ensure the Extra Monster Zone is available for the Special Summon.
• Sending 1 other card you control to the GY and Special Summoning 1 'Sky Striker Ace' monster from the Extra Deck occur simultaneously.
• The effect resolution finishes with the Special Summon. The 1000 ATK increase applies immediately upon Special Summon if the LIGHT and DARK condition is met.
• The Extra Deck Special Summon restriction applies as long as the activation or effect is not negated, even if the send or Special Summon fails.

Card-specific notes from database

• (Konami neuron) If you control a monster in the Extra Monster Zone at resolution, you must choose that monster as the card to send to the GY.
• (YGOResources) If an effect that banishes cards sent to the GY is applying, the chosen card is banished. Since it was not sent to the GY, the Special Summon is not performed, but the Extra Deck Special Summon restriction still applies.