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Leyline of the Guildpact Leyline of the Guildpact looked like a messy just-for-fun card when it was released, then went on to enable a meta-defining domain deck in Modern revolving around Scion of Draco

You could also redirect damage from an instant or sorcery source and then used Devoted Caretaker to prevent all of that damage

This card itself doesn't have an effect when he becomes a common hand cost for Patrollship, but since it can self-regenerate from GY, it goes well with being a cost

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To make things harder, you still need the Energy cards to attack, Trainer cards for deck flow, and possibly other Pokmon for techs and utility