Once you get it on the battlefield, then rather than drawing a card when you cycle, you get to play a card of the same type as the one you cycled from the top of your deck for free
Most cards like these only hit creatures, or nonland cards at most
Adeline, Resplendent Cathar is an excellent token generator, as it has a low cost and is a constant threat
She is however everything I don't like in a creature, she is mana intensive to get most value from, she is gold making her narrow, she is a legend making her vulnerable, she offers no value at all when deal with on sight and doesn't really have any particular synergy with anything
Each person at the table is going to be working toward a plan to advance their position and set you back, so you should make sure you are similarly prepared
A handful of cards help protect characters or heal their damage, including the Dinglehopper, which can continuously remove a point of damage every turn