Typically, you want to keep the average mana cost as low as possible, otherwise, your cards will be too expensive to play on your turn
Second, Replenish is a much older card that is very powerful for certain decks, specifically ones that revolve around the use of enchantments like this precon does
The weakness of the late game and reactive effects in these colors force the mono-Mardu player to remove permanents proactively, declare pre-emptive early game attacks, play hate cards that restrict opponents options, and generally make enemies at the table
#3 Mega Charizard X ex Ultra Rare Mega Charizard X ex Phantasmal Flames Ultra Rare Market Value Loading
Sleeves come in all kinds of colors and designs, so players can express their aesthetic style or interests with their sleeves
Obscuring Haze Obscuring Hazes value comes from its price tag: free, if your commander's in play