Its Anguished Unmaking stapled to Lightning Helix
As long as youve played any two lands before these, they come into play untapped
Say a card like Jace, Vryn's Prodigy asks if I have a certain number of cards in my graveyard
This may seem like an odd choice, but given how good Dragons can be in Commander, its hard not to look to this as one of the best options for destroying everything else if youre a big fan of scales, fire, and generally being bigger than everything else
That said, cards like Golos, the Tireless Pilgrim and Kenrith, the Returned King work extremely well with Zirda, the Dawnwaker, and both mana dorks and planeswalkers are essentially free (since tapping for mana and loyalty abilities are both activated abilities), while cycling also counts as an activated ability
And if you have more mana than your opponents, then the bigger edge you'll have over them