You may play it until your next end step
(Exile cards from the top of your library until you exile a nonland card with that mana value or less
So they are easy to find but very hard to collect them all
If you can't exile enough cards to meet or exceed the required mana value, you can't choose to collect evidence at all
Instead, So Much To Give is good for two important reasons
A standard Lorcana booster pack typically contains 12 cards + 1 puzzle/art/marketing card , arranged as follows: 6 Common cards 3 Uncommon cards 2 cards from the Rare, Super Rare, or Legendary tiers (non-foil) 1 Foil card - can be any rarity (Common through Enchanted) 1 Puzzle/Art/Marketing card (non-playable insert) In other words, each booster pack guarantees 12 playable cards: 6C, 3U, 2R/SR/L, plus 1 guaranteed foil