Theres no real way to get these boxes on the cheap
The Tools
Sarumans Trickery This card is actually tied for the highest win-rate uncommon (Fear, Fire, Foes
The massive card flow that people want for free in Commander and multiplayer lead them to attack each other, but not you, especially since they don't have to spend a card to get the card draw, so for them, this is free card advantage over time for each foe that attacks each other, and you'll draw more than the card it took to cast him in one or two turns
As ruthless as the Mardu are, it makes sense they make a bunch of cannon fodder to get rid of them at the end of turn
Players use creatures, spells, enchantments, and other types of cards to lower their opponents life total and defend themselves from attack