Celebi's design and lore are closely tied to themes of nature and time, echoing motifs of renewal and continuity that resonate with players and contribute to its timeless appeal
You should already be looking for the walking moxes that are green's mana creatures, so supplement them with artifact mana and a range of efficient, beefy green creatures at all points on the mana curve
The fact that it gains the basic land type you choose is massive, too, since it turns on synergies with cards like Utopia Sprawl, Verges, Checklands, etc
And you can skip to the good part by just casting Green Goblin straight-up if you want to
Garvin actually suggests starting with Commander if you arent hyper-competitive
Heres the breakdown by goal