Leaf can be obtained from Mew pack in the Mythical Island set
Even though Im not sure being a tapper is all that relevant in a game of Commander, you do get a Clue token when you do it, so its always going to be useful
However, if the defender has higher power, the attacker loses, but there are no other penalties
Similar cases occurred for "Phantom Beast Cross-Wing" and "Phantom Beast Thunder-Pegasus" needing to support "Gazelle the King of Mythical Beasts" (due to its Japanese name containing "Phantom Beast")
As a Light Dragon type Digimon, it possesses a unique and sought-after combination of attributes that make it both a powerhouse in battles and a collectible gem
The graveyard recursion and board wipes are a bit weak, but overall I love what I see in this deck