Blood Rage

If Loki’s Poison is played against an opponent that played Tyr’s Prowess, can Tyr’s Prowess counteract Loki’s Poison effect?

No, the the player with Loki’s Poison takes the revealed cards. Tyr’s Prowess can only prevent cards from being discarded as part of the normal battle rules, and not counteract the special ability of Loki’s Poison.
Related Rule(s)