Use the Double Summon card from your hand to Summon Giga Gagagigo using a Reptilianne Token as tribute 16
However, while free-to-start, there are microtransactions and multiple currencies in the store to acquire time boosters and other items, allowing players to open more packs
Of course, some of the moves are ridiculously expensive and not very good in use anymore, but for nostalgia, its a card worth getting
Otherwise, put it into your hand. Putting a card into your hand is nice, but you can literally win games by just combining Meren with Spore Frog, which you can sacrifice to prevent all combat damage for a turn - and only costs one mana
You can also sell your Pokmon cards here
Which deck has you the most excited