Purphoros, God of the Forge The original incarnation of Theros s mono-red god, Purphoros, God of the Forge is both a 6/5 indestructible creature and an Impact Tremors for just 4 mana
If you do this, make sure you keep the number of times you've cast each from the command zone clear for "commander tax" purposes
Many auras provide powerful buffs like a toughness boost or an ability like first strike, making the enchanted creature very durable
If you want to play with the Standard rotation and rules from 1999, you absolutely can
I think this largely comes down to the fact that blue and green rely less on refill draw, and can get by with topping up easily and cheaply as a game progresses
This can however be an irritation if you need to dig for lands as you want the cards right then