Use its effect to Special Summon it from your hand, as well as search for cards that require coin tosses
If you're always unlucky, you could restock the shop twice after finally getting the monster, trap, or spell you need, potentially spending over $400
but Grim Initiate will kill both the Witness and its Soldier leave-behind without giving up a single point to lifelink
While this does feel pretty similar to other abilities, like spree or escalate, the biggest difference is how those additional costs are paid and how many options can be chosen
This couldve easily been accomplished by multiple artists building off the same ideas together (see the e-Reader sets), but another thing 5ban brings to the table here, at least for the non-holos, is their awkward animation - it makes most of the Plasma Pokemon look strange and foreign, which suits the invading enemy vibe nicely