First, there's a new mechanic called Sneak, which is a riff on the pre-existing Ninjutsu, in which players can cheat big creatures onto the battlefield whenever an attacking creature goes unblocked
There is synergy with graveyard stuff on a bunch of decent affinity cards and so you can get some bonus value there too
Shadowless Charizard is a classic card that typically pops up and sells for megabucks, while even modern hits like Umbreon VMAX Alt Art are hitting $2,000
Allow you to take more cards in your hand, etc
Sacrifice decks typically want to tribute weak cards like 1/1 tokens or one drops
To view them, tap the card icon to the right of the home icon, toggle the button to the right of the binder icon with a Poke Ball, tap the magnifying glass icon, scroll down the search filters, toggle both options under the Card Dex View Options, and press OK