In the Rising Tensions event I played with Sarkhan (lvl 60) against Tamiyo (lvl 60).
My cards on the field:
Rakdos Cult
Shadow Spear
Song of Creation
Whirlwind of Thoughts
Tajuru Beastmaster
Gladehart Cavalry
On the opponent’s field:
Feasting Troll King
Harmonious Archon
As my Gladehart Cavalry attacked it was blocked by Feasting Troll King, which reduced Feasting Troll King’s toughness to 0. Then it continued to block Tajuru Beastmaster, too. Then it died and revived due to its three tokens.
I’d have understood if it were revived after the first attack and then blocked the second one.
Later it happened again without the tokens. So it blocked both again, the second one while having 0 toughness. And then died.
So, it seems Feasting Troll King can block anything before dying. At least in that match.