Blood Surge is a keyword ability that activates any time you use your BBS (Bloodbound Spell).
- Try to play your Blood Surge minions the turn you use your BBS to prevent them being dispelled or killed before you can use the effect.
- The neutral minion Cryptographer refreshes your BBS, so you can potentially gain the effect multiple times per turn.
- Blood Surge effects happen after the BBS' effect is resolved (contrary to Owlbeast Sage). That means if you control a Thraex, a Prismatic Illusionist, and an Owlbeast Sage and use the BBS, the spawned Illusion will be a 3/1.