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As for the lower-tier black MDFCs, Malakir Rebirth is a card I really like, but you do need to have quite a few creatures in your deck to make it worthwhile

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Saheeli generates a point of energy whenever you play an artifact or an artificer, and then has the option to spend three energy, at the start of combat, in order to create a 5/5 artifact creature token that's a clone of another permanent that you control

As one of the original Kanto starters, expect Blastoise to continue rising in price

However, the lack of any form of multiplayer is as baffling as it is detrimental to the competitive nature of the game, and with both single player modes having almost everything unlocked from the start the only reason to continue the experience is simply playing for playings sake