mtg foundations booster box or future Magic player Magic: The Gathering - Foundations

Ideally, you want to have a card like Crucible of Worlds [] or Life From the Loam [] as a back-up safety net in case this plan falls through, but neither card is necessary for the strategy to work

GR Gold Rare Downerd Magician X DARK Rank 4 [ SpellcasterXyzEffect ] ATK 2100 DEF 200 2 Level 4 Spellcaster monsters During your Main Phase 2, you can also Xyz Summon this card by using a Rank 3 or lower Xyz Monster you control as material

It is most useful when your opponent has already built up a field full of monsters (5 monsters in the regular game, 3 monsters in Duel Links), and they're ready to beat your life points (LP) down to zero, or close to zero, that turn

Every player gets a number of zombies equal to the number of creatures in their graveyard, so every turn will generate a hideous but ephemeral horde

Luckily, I have just such a spreadsheet created for you, updated for WAR