This meant that by granting abilities or through cloning, you could spread abilities that weren't naturally on the backup creatures
If it's the first combat phase of your turn, there is an additional combat phase after this phase
Id personally like to see more support for energy and experience counters in Commander, so I think proliferate adds a lot of variety to the format
Blood Moon turns all nonbasic lands into basic mountains, so decks that lean on fetches, duals, shocks, and fancy utility lands can suddenly be stuck doing nothing
I wanted to have a systematic way of approaching and identifying undervalued cards, and an equally systematic way for selling them, taking any guesswork/emotional attachment out of the process