The card is not splashy, but it reminds me quite a bit of another card previewed in a Commander deck that didn't seem all that splashy at first - Scavenging Ooze
One extra turn buys you plenty of advantages
Further Upgrades The first cards I'd pick up to further juice up the deck would be untapped mana-fixing lands: Watery Grave, Shipwreck Marsh, Underground River, Morphic Pool, Darkslick Shores, Polluted Delta, Sunken Ruins, Undercity Sewers, Urborg, Tomb of Yawgmoth and then maybe a couple more Island / Swamp fetches
Equip Artifact - Equipment Warrior's Sword Job select (When this Equipment enters, create a 1/1 colorless Hero creature token, then attach this to it.) Equipped creature gets +3/+2 and is a Warrior in addition to its other types
This is because Leafeon ex is the one who will need to spend more time in the Active Spot , building up your ambitions through Forest Breath
Of the 12 multicolor cards in the deck, only two don't require green mana