If I as a player obtain Hexproof would I all be affected by Annihilator? The description of annihilator says that defending player sacrifices permanents and not target player, so it seems technically I'm not being targeted and therefore I'm not immune due to Hexproof.
Your interpretation is correct, a player having hexproof won't help against annihilator, because it doesn't target the defending player.
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If I as a player obtain Hexproof would I all be affected by Annihilator? The description of annihilator says that defending player sacrifices permanents and not target player, so it seems technically I'm not being targeted and therefore I'm not immune due to Hexproof.
You are affected by Annhilator normally.
There's no 'technically' in Magic. You are factually, literally, not being targeted by Annihilator.
What if instead of Sigarda, Heron's Grace I control Sigarda, Host of Herons? The latter states abilities my opponents control can't cause me to sacrifice permanents, which is exactly what Annihilator does.
For example, if I control Sigarda, Heron's Grace and my opponent attacks me with Pathrazer of Ulamog, would I still have to sacrifice permanents?
You are affected by Annhilator normally.
There's no 'technically' in Magic. You are factually, literally, not being targeted by Annihilator.
Yes.