Normally the most cost-efficient way to get a lot of packs is to buy a full booster box from your local store
For each opponent who does, create X 1/1 red Elemental creature tokens with haste
Here they are, by color: Now you dont need to keep up mana for Rootborn Defenses
The idea is that you can mash them together and then take them apart to do it with a different combination
Card Name Lightning, Army of One Mana Cost Type Legendary Creature Human Soldier Rarity Mythic Rare rules Text First strike, trample, lifelink Stagger - Whenever Lightning deals combat damage to a player, until your next turn, if a source would deal damage to that player or a permanent that player controls, it deals double that damage instead
The idea is that youll make your opponents exile their creatures when you sacrifice yours