Each time you draw a card, you put a loyalty counter on it, and the tokens Teferi creates also get +1/+1 counters
The reason being, you can cast your rituals during your main phase, but then you can't cast Savage BeatingSavage Beating until combat, when all that mana will have drained from your pool
Red decks are good at creating explosive turns, securing an early advantage, and just generally controlling the pace of the game through disruption, constant pressure, and a bit of calculated chaos
These sorts of Jund decks have been a staple in Standard for years, and its difficult for a deck full of small creatures that need to work together to win to beat a monstrous pile of removal and unbeatable creatures
Before, in formats like Modern, while the removal was good, you could play around it or attack from an angle that was less susceptible to it