Many people arbitrage between online and OTC/offline tradesvendors at card shows do this on a large scale, with their main income source similar to market makers or liquidity providers in crypto, earning the spread and relying mainly on volume and volatility
The primary win condition for a Tiamat Commander deck is winning through combat
Once per turn, if you would Tribute a monster you control to activate a card effect, you can Tribute 1 DARK monster your opponent controls, even though you do not control it
The general idea of the game is to use monster cards with the support of trap cards, and spell cards to attack and deplete the opponents life points
The amount of damage Terror of the Peaks deals is the entering creature's power as the triggered ability resolves
It's still a laborious task that essentially ends the game in a draw