[[Gideon Blackblade]]'s invulnerability has proven invaluable in Training and, in particular, in Story, where most of the scenarios' objectives, high numbers of unlikely and/or uncontrollable and/or detrimental things (achieve the feat of eight of your creatures being destroyed!) cannot normally be completed before the computer or the player are dead.

Leveling too much, worst case scenario

#Story mode: Five Planeswalkers; the first gets 20 XP, the rest get 2 XP per card per game, twenty eight XP on cards, for ten gold for all-color completion. The Objective reward is cheaper, or free if done at the same time, for 15 gold. This can be seen as 20 XP for 15 Objective gold and eight XP for 10 Completion gold. In total, 25 gold for 28 XP