Splashability is when a card or group of cards can be used outside their own deck/archetype to achieve benefits in combination with entirely unrelated cards. Taking this into account when making custom cards adds a lot of depth and therefore fun to the process while also achieving more balanced results, but for a long time I didn’t really do that. So once in a while I have the funny experience of looking back at older designs and realizing they do something generically useful I wasn’t actually going for. Here’s one such example.
Bohrok Tahnok can shuffle itself into the Deck to destroy a face-up monster, and this is a Quick Effect. Already seems quite useful, but between having to return to the Deck, the limitation of the targets to only face-up monsters, the fact that it targets at all, and the lack of a built-in way to easily bring it out, it probably wouldn’t be that good to just splash it into random stuff.
In comes the second card of this package, the Krana Ja. By discarding it from your hand while you control a Bohrok, you can scout ahead and render everything that is already visible on your opponent’s field ineffective during the following turn, and like many other Krana it can return from the field to your hand during Main Phase 1 to bring out a Bohrok from the Deck at the cost of immediately ending the turn.
The bottom line is that by just getting a Krana Ja on the field somehow in your Main Phase 1 (e.g. with One for One or simply a spare Normal Summon), you can easily out any single monster that can have its effects negated. Return the Ja to your hand to Special Summon a Tahnok from your Deck, activate the Ja from your hand during the immediately ensuing End Phase (since you do have a Bohrok now), then in the following turn activate the Tahnok’s Quick Effect to target and destroy whatever you like. At this point all protection and/or negation on your opponent’s field will be negated by the Ja, so you don’t have to worry about that stuff at all.
Now, this does ultimately cost you your Battle Phase and only takes care of a single monster, so it probably isn’t really that impactful in the grand scheme of things. But I found it pretty funny that these two cards on their own could pull this off even though neither of their designs was in any way geared towards it. The Tahnok just has a Quick Effect because it’s fast, and the Krana Ja does what it does because it’s literally a Scout.