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Duplicates can also be received from Wonder Picks and trades

Stonehewer Giant Stonehewer Giant has a pretty large casting cost, and you need to wait for another turn until you can start using it as a tutor

Mycosynth Golem Mycosynth Golems one of the more restrictive cards here since it only affects artifact creatures, but I can get behind a freeor almost freeCityscape Leveler or Phyrexian Triniform, especially considering how easily affinity powers this golem out

You cast Scion for WURBG, and its a flying 4/4 as standard, but you can pay two mana to find a Dragon from your Library, put it in the graveyard, and then have Scion turn into it until the end of the turn