Note that you can only exchange duplicate cards starting from a rarity of for trading tokens
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Level X Rayquaza has a handy move called Dragon Spirit, which lets you attach any energy card from the discard pile to Rayquaza when active and attacked
Ekundu Griffin Rarity: Common TYPE: Creature SUBTYPE: Griffin CMC: 4 Mana cost: USD: $0.11 EUR: 0.09 TIX: 0.12 EDHREC RANK: 24077 (2/2) Flying, first strike Elixir of Vitality Rarity: Uncommon TYPE: Artifact SUBTYPE: - CMC: 4 Mana cost: USD: $0.12 EUR: 0.20 TIX: 0.15 EDHREC RANK: 29852 This artifact enters tapped
Cool, I'll put 20 more cards in my deck
That said, Satoru Umezawa is a new card that grants every card in your hand ninjutsu, and that could lead to some very silly stuff when combined with thirteen-mana Eldrazi in formats like Modern