Your lands are generally pretty slow, and I don't recommend the bounce lands (Rakdos Carnarium and friends) without a specific purpose beyond simply mana fixing
Aucun produit
While some sellers use bubble mailers and toploaders to ship cards, as is good practice (though plain white envelopes can also work if packed with a piece of paper), Ive also gotten a lot of terribly shipped cards from inexperienced or cheap sellers
Phantom Blade and Assimilation Aegis are the standouts here, providing repeatable removal that can take out your opponents biggest threats each turn, and can be easily searched for by the decks variety of Equipment tutors
Four mana is a lot for a creature tapping for mana, but this makes up for it by tapping for lots of mana
If they had a really good, expensive card in their deck and the other guy chose a basic land or otherwise relatively worthless card, players would be understandably upset and try to back out of the deal