mtg green haste cards Big creatures with is fair right? (Commander / EDH Deck) How has this not been

It has flying to slip on through, so it hits and trigger

Loxi: The obvious comparison is to Teferi's Protection, and while I don't think this is technically as outright powerful, it's so negligibly close that I think both are pretty much equally as powerful

Garruk's Uprising even draws a card up front if the player already has a sufficiently large creature, and later creatures will mean more draws

The rule exists because some cards are broken if allowed in high numbers

Some of the most popular commanders for spell slinging decks are Mizzix of the Izmagnus, a card that can greatly reduce the costs of instants and sorceries, and Veyran, Voice of Duality, a card that doubles any abilities that trigger from casting an instant or sorcery