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The [Main] effect of "OP07-096 Tempest Kick" lets you choose an opponent's character to lower cost for after looking at your drawn card

Obviously these may be a miss for your format for other reasons (power, archetype mismatch, rarity, don't run planeswalkers etc) but here's a few that I found interesting, divided by broad category rather than color: While I'm still not done reading Cosima, God of the Voyage (I'm on chapter 2, the language is a bit dense) these cards are ones I do like both sides of

Conjure is an Arena-focused mechanic that automatically creates copies of specific cards to add to your library

Skeletal Scrying is probably the best of the bunch being that it is an instant

Kassandra, Eagle Bearers Assassin typing also makes it a viable addition to Assassin kindred decks led by Altar Ibn-LaAhad and Ezio Auditore da Firenze