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Composite Golem?
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I looked at that, but I found that 6 mana for 5 produced just isn't efficient. I need a lot of ramping, and with artfacts, that's not simple.
I find that paying 6 mana for a 4/4 that sacrifices for 5 isn't efficient.
Kaleidostone? Draws you a card and gives you the mana conversion... and Channel the Sun can be helpful. Also Bringer of the Black Dawn can help you summon the door or the Progenitus
Are they all modern?