mtg cards that double loyalty counters Planeswalkers counter in blue or green? except it enters with an additional +1/+1 counter on it if its a creature Spark Double · Ravnica Remastered

Chord of Calling is good in Commander, of course, but Ive only ever seen it used in base-green decks that go heavy on the tutors

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

Sokenzan, Crucible of Defiance can even be used on defense as flash creatures

Enchantment creatures are enchantments, and as such, they trigger mechanics like eerie and constellation when they enter

His sheer intelligence surpasses that of ordinary humans, and is renowned for several innovative innovations that currently support the people of his city

Today, this card's price will easily set you back $40,000-$50,000 for a played copy