In heads-up games, you can always force a wheel if thats what you want
Is There Any Limit to the Tax
The Rakdos (black/red) color works wonders as it gives you access to many cards that deal a lot of burn damage every turn cycle
The base list does include A+ cards like Blightstep Pathway, Voldaren Estate and Den of the Bugbear, but to keep the price at accessible levels, youll also be starting with a playset of Bloodfell Caves
Casting Cost: Card Text: Bloodthirst 3 (If an opponent was dealt damage this turn, this creature enters the battlefield with three +1/+1 counters on it.) Trample (If this creature would assign enough damage to its blockers to destroy them, you may have it assign the rest of its damage to defending player or planeswalker.) You might also be interested in these products
This allows you to utilize a massive amount of artifacts at a time, and get the most value out of cards like Affinity and Improvise that value large numbers of artifacts and mechanics