Hm...
The evolution from Permanent to Creature is a bit odd (why not just leave it as a baby Garou Spider unupped?), but if I get this right, every time 'Trap' is triggered, the Permanent/creature becomes "Unburrowed" in the process, right? So you get a free trap upon summoning, but then it requires it to be 'reset' with the use of
quanta. (This mixes well with Adrenaline-vampires
)
The one thing I REALLY like about this card is how the Garou Spider can combine will all forms of 'buffing' cards (including Nightfall), to deal more damage upon 'activating' the trap. The delay is just frosting - always nice to have, but possibly OP against some cards. 20% is low enough that not every creature is going to trigger the trap (nor will it trigger every time), and the fact that it has auto-protection upon being summoned is really helpful.