Its the idea that you spend your cards more efficiently than an opponent, and in doing so, you gain an advantage
Its a thematic deck using as many cards from Return to Ravnica as I could fit in, and its definitely fun to play, just not very powerful by any competitive standards
It also has the new Revolt mechanic, which lets you destroy target creature with converted mana cost of four or less if a permanent you controlled left the battlefield this turn
You get a standard Hydra (, enters with X counters) with three keywords which matter a great deal - protection in the form of Vigilance, evasion in the form of Trample, and surprise from Haste
Like Kastral, Jackdaw Savior gives you a way to get Birds back from the graveyard that may have been milled by Chocos trigger