If this card is moved to a zone it was pointing you may destroy a number of cards your opponent controls equal to the number of empty main monster zones on your side of the field
By itself, it might only be about the size of a wall
If Indatha Triome, Urborg, Tomb of Yawgmoth, or any of the shock lands are giving you trouble, feel free to swap them out for whatever dual lands you have on hand
Master Duel 2022-01-19 " Metaphys Ascension " pages Yu-Gi-Oh
Even a card like Mirror Box will allow you to make as many Boos as you please, and these are only a few of the countless ways to synergize with this card
Undo allowed you to completely break the symmetry of the format: you would play a turn three 2/2, your opponent would play a turn three 2/2