This is because this will be an Illustration Rare card in the Mega Evolution set , meaning its pull rate will be tougher to beat than ordinary cards
For some inspiration, look at this decklist, which placed 7th in the Juniors division at the Stuttgart Regional
You can see the difference in things like PSAs population reports, which detail over 23k copies of Moonbreon, compared to only 4k copies of the lovebirds
This can rapidly power up your Pokmon, enabling them to attack sooner than expected
It can search out any dragon you need with its -3 ability, which keeps your hand stocked with threats, and its ultimate absolutely devastates the board by wiping out all non-dragon creatures
Or, if you're just starting out with this format, we'd recommend starting out with MTG commander precon decks instead