Ultimate Bright Knight Ursatron Alpha

(This card is always treated as an "Ursarctic" and "Drytron" card.) Cannot be Normal Summoned/Set. Must be Special Summoned by card effect. If you control an "Ursarctic" or "Drytron" monster, except "Ultimate Bright Knight Ursatron Alpha": You can Special Summon this card from your hand, then you can add 1 "Ursarctic" or "Drytron" Spell/Trap from your Deck to your hand. You can only use this effect of "Ultimate Bright Knight Ursatron Alpha" once per turn.