Enchant creature
(Target a(n) creature as you cast this object. This card enters attached to that creature.)
As long as enchanted creature is attacking alone, it can't be blocked.
Enchanted creature has "Whenever this creature deals combat damage to a player, it
connives (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on this creature.)."