Alternatively, you can add some more variety to the creatures in this deck, with cards like Gladiolus Amicitia and Tannuk, Memorial Ensign both giving an added dimension to the deck , and, as legendary creatures, you only need to add one or two copies so you wouldn't need to readjust your mana, bar maybe including one or two extra mountains in place of forests.
Kotis pairs beautifully with cards that boost power like Death Baron, since the more damage it deals, the more cards you get to steal
The intentional including of some weaker, not-on-theme cards for the reprint machine, like Brilliant Plan, Kongming, "Sleeping Dragon", or newer cards that weren't on theme like Tidal Force are the only things keeping the synergy from your deck from breaking people in the face unfairly
(To collect evidence 4, exile cards with total mana value 4 or greater from your graveyard.) You can't exile Lamplight Phoenix from your graveyard to pay the collect evidence cost of its triggered ability
Theros looks to be an incredible set full of fun cards to experiment with
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