mtg journey into nyx cards Wizards Of The Coast Whenever equipped creature blocks or becomes blocked by one or more creatures Magic the Gathering Journey Into

For that, you're getting literal free mana since the card has no mana cost but taps for mana, so long as you control a dragon

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The idea that intrigues me there is Cauldron of Soulsyou could cast a battlefield wipe on your turn and then attack with your slightly smaller team without resistance

If you have more than two instants or sorceries in your graveyard when this resolves, you get added to your mana pool, making this essentially a Demonic Tutor

Free lands are good