A similar dynamic exists with any other one-mana interaction like Stubborn Denial and especially Spell Snare, but even without another option for that opening mana, waiting to see what your opponent is playing can inform your cantrip
Trazyn the Infinite + Mana Rocks + Staff of Domination The dream is Trazyn the Infinite copying a mana rock like Gilded Lotus in your graveyard, then using Staff of Domination to untap Trazyn and do it again for infinite mana, which Staff then turns into your whole deck or infinite damage
This is Magic's 88th expansion, but it's the first time there's been a direct crossover between Magic and Dungeons & Dragons
Let's repeat that: zero Energy cards
As the 2nd true flip Planeswalker on both sides (Garruk Relentless into Garruk, the Veil-Cursed was the first), Arlinn offers a lot of options
Night's Whisper 7 The Deep Analysis you don't have to discard