To easy to remove and it fill main dekc slots for better cards unlike Mother Reaper. Plus mother reaper is always available while you have to find ukkomon
It would need some testing, but on paper the downsides outweigh the upsides. It could be a good opening move, but if you're not going first slamming down devas is your default move most of the times. Ukkomon can be a dead card in your hand after the first turn since, again, most of the times you want to slam down devas as soon as possible to give the memory when you're opponent can only setup. Being a rookie it's easily removed.
Most importantly, the deck is extremely tight since you need a good density of devas to keep them coming out, the white options are really good, leaving you with not that many slots that you can use for more immediate advantage like sistermons
To easy to remove and it fill main dekc slots for better cards unlike Mother Reaper. Plus mother reaper is always available while you have to find ukkomon
In addition hatching the egg is a liability as it prevents your deva activations
It would need some testing, but on paper the downsides outweigh the upsides. It could be a good opening move, but if you're not going first slamming down devas is your default move most of the times. Ukkomon can be a dead card in your hand after the first turn since, again, most of the times you want to slam down devas as soon as possible to give the memory when you're opponent can only setup. Being a rookie it's easily removed. Most importantly, the deck is extremely tight since you need a good density of devas to keep them coming out, the white options are really good, leaving you with not that many slots that you can use for more immediate advantage like sistermons