Once you hit that five-counter threshold, all your creatures get +5/+5
You can then use this card to chump block and sacrifice it to go find a land, giving you a bit of extra time and mana
They have 12 or 13 cards instead of 15, and their card distribution is pretty complicated: 1 art card (5% chance of a signature variant) 1 land (15% chance of a foil land) 6 connected cards 35% chance of 5 commons, 1 uncommons 40% chance of 4 commons, 2 uncommon 12.5% chance of 3 commons, 3 uncommons 7% chance of 2 commons, 4 uncommons 3.5% chance of 1 common, 5 uncommons 2% chance of 6 uncommon 1 showcase variant 2 wildcards of any rarity 49% chance of 2 commons 24.5% chance of 1 common, 1 uncommon 17.5% chance of 1 common, 1 rare/mythic 3.1% chance of 2 uncommon 4.3% chance of 1 uncommon, 1 rare/mythic 2.6% chance of 2 rare/mythics 1 rare/mythic 1 foil of any rarity 1 token/ad card with a chance of being a card from The List You basically sacrifice the boosters ability to be used in a Draft for a chance at multiple rares
So whats yours?
If the opponent knows that you have it, they can side in answers or change the plan (for instance Murktide players can side out Murktides, DRCs and rely more on Ragavan, Ledger Shredders and planeswalkers)