Excalibur, Sword of Eden is the dumbest thing printed since Mechtitan Core, and now the Mechtitan needs to swap out its frankly mid giant sword for Excalibur and games will surely be won from there, right
The second metagame consideration is that control strategies have not been putting up good results recently compared to the more proactive archetypes, and may not be well-positioned
To me, this card seems like it will trigger with a lot of different effects: Lurking Predators, Resurrect effects (undying/persist), Blink effects, casting your general (if 3+ power), you name it
Unless otherwise stated, each defender creature can only block one attacker
Galufs Final Act does two things
Alibou, Ancient Witness gives your team some extra reach, pushing damage through before blockers are even declared