Garruks Uprising by contrast takes the typical Green approach of tying draw draw to creatures, in this case whenever you drop out a creature of power 4 or greater plus a bonus if you already had one out when the Enchantment hits the battlefield
Maha, Its Feathers Night is definitely a powerful creature - the fact that it's a 6/5 flyer and trampler for just five mana is already aggressively costed, especially for Black
Regenerate Does Not Stop Effects That Affect Toughness If a Creature's toughness becomes zero or less, it will be put into its owner's graveyard as a state-based action
Its particularly effective against tokens, since theyll never come back
Some creatures like Agent of Treachery are bad enough when you get hit by their ETB once, but you can easily use them again and again while also jumping ahead on lands to drop other powerful cards
Invasion of Regatha / Disciples of the Inferno Im simply gonna skip this cards battle side and go straight into the creature