If you have ways to gain a lot of life early on, you can pay a ton of life to get your whole deck into your hand winning the game with all your win conditions in your hand when your turn comes.
Relentless Rabbits (version #1) 1W Creature Rabbit 2/2 CARDNAME has +4/+4 as long as you control six or more Rabbits
It saves you the most money in the long run, heres a quick calculation: At 750 gems : $0.00675 per gem ($4.99 / 750) At 20,000 gems : $0.00499 per gem ($99.99 / 20,000) At 40,000 gems : $0.00499 per gem ($199.99 / 40,000) If you buy the 20,000 pack, you save (20,000 / 750) x $4.99 $99.99 = a little over $33
You can also purchase fully assembled competitive tier decks, such as the top decks from the most recent Magic World Championships shown below
Do you absolutely need to know every Disney Lorcana card ever shown