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You can only use this effect of "Noble Knight Eachtar" once per turn

Riolu can be obtained from Shining Revelry pack in the Shining Revelry set

Fallen Paradise of the Sacred Beasts X SPELL Field Up to thrice per turn, during your Main Phase: You can send 3 other cards of the same type (Monster, Spell, or Trap) from your hand and/or face-up field to the GY, then you can Special Summon 1 "Sacred Beast" monster from your hand, Deck, GY, or banishment, and if you do, it is unaffected by your opponent's activated Spell/Trap effects

This triggers once per turn

Some people even create custom proxies with different art or card backs