A blast from the past, cycling decks were extremely popular in Standard after Ikoria was just released. However, they quickly got outclassed by decks like Wilderness Reclamation (now banned) and Jeskai Lukka (lost Fires of Invention to a ban).
The deck gets a chance to shine in Standard 2021 as plenty of powerful cards are rotating from other decks.
Boros Cycling is built around the cycling mechanic (discard the card with cycling to draw a card) with payoff creatures rewarding you for cycling. The deck also has a finisher in the form of Zenith Flare, a card that can deal an immense amount of damage depending on the number of cycling cards in your graveyard.
If you want a budget deck that can also hit hard against top tier decks, this may be the deck for you.