Just like Garfield intended (EDH / Commander)

Jasmine Boreal of the Seven deck. Morph creatures do not have an unmorph "abillity" the abillity to unmorph is granted via rule 116, its a special action that cannot be responded to. This means that "casting" a card for its morph can be mana from Jasmine but unflipping cannot be done with it (You are not casting the creature).
Other vanilla creatures are based on the key "features" they have, for example 5 drops are the strongest as they can be expected to be cast one turn after our commander. Cards that cost less than our commander usually have too poor statlines to warrant being included, the many pikers (3/1 creatures) are not bad but single damage ping can show up with things like Spikefield Hazzard.
Since each vanilla creature needs to be basically enough of a threat on its own with the commander they were all chosen based on their Power vs their mana cost. This is why i dont have Leatherback baloth, it can only be cost reduced for 1 green by simone and offers mostly toughness as a reward for the casting cost.

The essential gameplan is to ramp up while continously presenting single target threats to your opponents while looking for ways to reload the battlefield with Turntimber Symbiosis, You Meet in a Tavern and Storm the Festival ( Which can also be a overpriced ramp spell).

Moon-blessed Cleric can find Sandwurm convergence or Paradox zone to slowly win on another front, or get marshal's anthem to rebuy one of your creatures and keep swinging at the enemy. Early on it can also get sylvan anthem to help dig while putting down your durdlers.

The fundamental issue in my decks construction is that this is all very slow, ramping off individual land drops and a few mana rocks can be enough but efficent modern cards that throw out treasures while doing something on the board will outpace you and also be in colors that just redraw their hand nearly full having boardwipes, removal and couterspells.
Allosaurus sheperd could help atleast on one front and this could also benefit from creature tutoring in theory, as Ruxa, Patient Professor does double duty in this deck too.