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So, if your opponent wants to Summon a monster or activate a Spell, you can negate it as long as you have the right Counter Trap face down

It's often tricky to get the mana right in decks that are more than one color

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

One of these recently sold for over $20,000