Point is, the whole strategy revolves around casting spells from exile, from your graveyard, from your library, and so on, and bolstering paradox payoffs like Flaming Tyrannosaurus and Impending Flux
Each descend 4 and descend 8 ability is different and the bonus for achieving the desired haul in your graveyard changes from card to card
Red is one of the best, and having access to green gives you the ability to ramp and help fix your colors so you are always able to cast your spells
There are typically two types of cards that get banned: cards that do fundamentally broken things (Hypergenesis, Rite of Flame, Summer Bloom), and cards that are so universally powerful that they become ubiquitous (Deathrite Shaman, Stoneforge Mystic, Mental Misstep)
Is my card good now or do I need it later? Can I cycle to dig deeper into my deck or do I wait to get value out of this cycling effect. The short answer is that if you can get away with it, cycle as much and as fast as you can to set-up and get the cards you need to win
Prowling Felidar is a 2/3 with vigilance for 3W, and each Landfall trigger will put a +1/+ 1 counter on it