I would suggest to play Flagstones of Trokair. If 1 is in play and you play the next the will both be put into graveyard cause of the legendary rule and you get 2 plains (tapped) but good for emeria, the sky ruins as well as getting your Sun TItan faster. After you played your Titan the Flagstones can be retunred and used to get lands out of your deck to be safe you draw something more helpfull in middle/lategame to finish
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You should play 4x Brainstorm...it boosts your coatl by 3 counters, gives card advantage and flexible options during play.
not finished yet