Thats got nothing to do with coin flips, so were obviously here for Odds
Generally, these spells have you trading a creature or permanent, often by destroying that card, to reveal cards from the top of your deck until you find something that shares a card type with them
An effect may refer to a card, spell, or permanent that "has an Adventure." This refers to a card, spell, or permanent that has an adventurer card's set of alternative characteristics, even if they're not being used and even if that card was never cast as an Adventure
This can be a tough decision for certain decks
And it provides some serious mana ramp, as any time a modified creature you control deals combat damage to a player, you can put a basic land from your library onto that battlefield
The big pull here is, of course, all the legendary creatures almost making this more a mini-Commander Legends set