This means that not only can you access additional cards, but you can reactively play the majority of the spells in your deck during an opponent's turn
You also get a nice proliferate loyalty ability to boost multiple planeswalkers at once, and a great final ability to take an extra turn
Thankfully, there are still plenty of new Mega Evolutions from Pokemon Legends: Z-A that have yet to receive their own cards, including both versions of Mega Raichu, and the newly revealed Mega Garchomp Z
It gets better when you're dealing with a 187 creature, but it's fine even when all you're doing is saving your best guy from a removal spell
Pok Ball and Professor's Research are phenomenal cards in every deck, as they provide a phenomenal amount of consistency and allow players to have the cards they need during every turn
Cannot be used as material for a Fusion, Synchro, Xyz, or Link Summon