Notably, opponents can't try to remove your commander to change how many modes you may choose
The biggest issue with other cards that provide additional draw effects for your opponents is that the player to your left, the player whose turn other additional draw effects would help first, has access to the extra cards first, giving them an advantage over your other opponents
But they are all common or uncommon, which makes acquiring their singles much easier
You can drop this on turn three, sacrifice a two-drop artifact dork for two cards and two mills, sac it to Goblin Welder to swap for something you just milled or what you sacrificed, and then swap the sacrificed or milled card on turn four for this to keep
Portent of Calamity For five mana I can drop Omniscience if its in my top four cards on top of drawing three cards
Over in Modern, Aunties Hovel and Warren Instigator both more than doubled in price as people rushed to pick up their pieces for Modern Goblins