Sky Striker Mobilize - Linkage! — Ruling

Effetto 0

When this card's activation resolves, choose 1 other card you control, send it to the Graveyard, and Special Summon 1 "Sky Striker Ace" monster from your Extra Deck to the Extra Monster Zone. (These effects are treated as happening simultaneously.)
If you control no monsters in your Main Monster Zone, you can activate this card even if you control a monster in the Extra Monster Zone. If you do, you will send that monster to the Graveyard when this card's activation resolves, then Special Summon a "Sky Striker Ace" monster as usual.
This card cannot be activated during the Damage Step.
This effect's resolution ends with the "Sky Striker Ace" monster being Special Summoned. (If you have at least 1 LIGHT and 1 DARK "Sky Striker Ace" monster on your field and/or in your Graveyard at this time, the Special Summoned monster also immediately gains 1000 ATK.)