Behind the Ferns

Behind the Ferns
Ongoing SpellBuffCost: 2
Channeling (Stays in play. Sacrifice it when you lose your Feral hero.)
Your units with 3 ATK or less have stealth. (Can sneak past patrollers if that opponent has no detector.)
GreenFeral Magic

Card-Specific Rulings
If you have Behind the Ferns and a Steam Tank (3 ATK), then attack a building with Steam Tank, it still does get stealth from Behind the Ferns. The extra ATK from Steam Tank's ability kicks in after the check that lets it sneak past patrollers. — Sirlin
Interactions between Behind the Ferns and Midori's mid-level ability (which gives +2/+2 to units without abilities) depend on the order of events. Some examples using those cards and Overeager Cadet (a 2/2 with no ability). If you pay Ferns -> Cadet -> Midori or Cadet -> Ferns -> Midori, your Overeager Cadet will be a 2/2 with stealth. That's what he is at step 2 of those examples, so at step 3 when Midori's middle ability is involved, it will not buff Cadet because at a that point, Cadet does have an ability (stealth from Behind the Ferns). Similarly if you get Midori -> Cadet -> Ferns or Cadet -> Midori -> Ferns, the Cadet will be a 4/4 before Ferns happens, so it will stay a 4/4 with no abilities. However, if you play in this order: Ferns -> Midori -> Cadet or Midori -> Ferns -> Cadet, then the cadet is arriving while both effects already exist. In these cases it is also a 4/4 with no abilities. — Sirlin
Stealth Rulings
"Sneaking past" means you can ignore patrollers when attacking and attack anything you want. You can also attack the patrollers if you prefer. — Sirlin
When something with stealth attacks an enemy unit or hero, that enemy unit or hero DOES deal its combat damage back as usual. — Sirlin
If an opponent has the Tower add-on and their tower has already used its once-per-turn detect on something, then you attack with something that has stealth, the Tower will not deal its damage to your stealth thing. It would if it's once-per-turn detect hadn't been used, but it can only damage things it can see. — Sirlin