Slippery Scoundrel

If you control ten permanents but don’t control a permanent or resolving spell with ascend, you don’t get the city’s blessing. For example, if you control ten permanents, lose control of one, then cast Golden Demise, you won’t have the city’s blessing and the spell will affect creatures you control.

Some cards get power, toughness, and/or abilities once you have the city’s blessing. If another card has an ability that triggers when creatures with certain characteristics enter the battlefield (such as Mentor of the Meek or Elemental Bond do), use the entering permanent’s characteristics after you have the city’s blessing to determine whether those abilities trigger. This is true even if the entering permanent is your tenth permanent.

If you cast a spell with ascend, you don’t get the city’s blessing until it resolves. Players may respond to that spell by trying to change whether you get the city’s blessing.

Once Slippery Scoundrel has become blocked, getting the city’s blessing won’t cause it to become unblocked.