Death Tyant shines in combat, turning any creature death into 2/2 Zombie tokens
If you gain an amount of life "for each" of something or "equal to the number" of something, that life is gained as one event and South Wind Avatar's last ability will trigger only once
Anyway, back on topic, all Ramp decks since the beginning have looked to build their mana to ridiculous levels as quickly as possible and then use that advantage to drop more powerful win conditions earlier than their opponent and ride that to victory
This demands players to judiciously manage their resources, ensuring the efficient casting of spells while strategically countering the actions of their opponent
But theres literally too many other good ones for me to easily list
from the rapid decisions to the almost psychic knowledge of their librarys contents, theres no other form of Magic that comes close