The best Shift target is probably Peter Pan - Never Landing but if you want to stick to Ruby cards, it would be the Peter Pan we just looked at, Peter Pan - Never Land Hero
Use the effect of that card as the effect of this Ability
CYAC-JP005 Choujuu Musha Souru Gaia Booster (Superheavy Samurai Soulgaia Booster) Level 4 EARTH Machine Effect Monster ATK 0 DEF 0 You can only use the 2nd effect of this cards name once per turn
Card Name Mana Cost Type Creature Human Rebel Rarity Special rules Text When this creature blocks, at end of combat, destroy it and all creatures it blocked this turn., : Search your library for a Rebel permanent card with mana value 4 or less, put it onto the battlefield, then shuffle
You can use the r/PokemonMisprints community to see if its an error or a fake, or go with CGC, one of the best Pokmon grading services for error cards