It might have made more sense for the Worthy mechanic to also require the creature to have the new Hero subtype, making it a better fit for the Marvel Super Heroes set
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Athreos, Shroud-Veiled Athreos, Shroud-Veiled is otherwise known as the worse Athreos
The Darkness Crystal Rarity: Rare TYPE: Legendary Artifact SUBTYPE: - CMC: 4 Mana cost: USD: $11.22 EUR: 7.67 TIX: 0.02 EDHREC RANK: 1314 Black spells you cast cost less to cast
If you want to get more convoluted, you can add a Panharmonicon to the mix: Restoration Angel can flicker another creature at the same time, and Felidar Guardian can flicker a land in addition to the Angel, resulting in infinite mana as well
It's a heavyweight, sure, as well as the later iteration it inspired in Electrolyze