Isilla card :S

[Little Sara]

I consider those cards as a "fun feature", you don't build a crit assassin with a Vanberk in the off-chance it will trigger. Similarly a 5% or 10% in wings chance of activating some effect isn't reliable enough to be counted upon.

The same can be said for Myst Case card and other "get a chance to get this when you kill a monster" cards/equips (hero backpack, celebration wings), they are a fun feature when hunting PVM, especially low level enough monsters that you don't need the full power of your character, but not something you bring in pvp, woe, or MVP.

For the record, I find the "Get +5 HP every kill of x type" to be completely useless, I hope Gravity eventually changes those. Even Sky Deleter's "Get +100 HP every kill" is pretty useless, unless you're killing Peco Pecos or something equally weak, or you one-shot everything.