When you discover/summon a Razormane Battleguard as a 1/2 with Cactus Construct, your first taunt minion is not discounted by 2. Steps to reproduce:
- On turn 1: play Cactus Construct and discover a Razormane Battleguard
- [1/2 Razormane Battleguard is summoned]
- Your discovered Razormane Battleguard should be 0 mana, but it still costs 2 (bug).