That refers to an archetype in Magic: The Gathering where you aim to do 20 damage to your opponent as fast as possible with simple spells like Lightning Bolt
Now you're actively rewarded for getting rid of your lands at exactly the right time
This is among the best Enrage abilities across any Dinosaur card, and even if you only get one or two lands out of this, it will still likely have been worth the investment as a blocker or in a pinch an attacker backed up by combat tricks or a fight/bite spell
Shout out to Urza's Saga which tutors any artifact to the battlefield without a sac, but just a one drop or less, like Skullclamp and Sol Ring or a land
Cloudstone Curio Cloudstone Curio from Ravnica: City of Guilds is another infinite combo enabler, though a little trickier to use since it usually requires three separate cards to work
If you cast a spell for another cost "rather than paying its mana cost", such as an emerge cost, you can't choose to cast it for any other alternative costs
