This card is fantastic. Doesn't really act as a secret, which is what differentiates it from something like Avenge. It's basically a delayed buff that can give up to +7/+7 in raw stats for 1 mana. If you're also running Mad Scientist, it can help as an enabler. Great potential with recruits.
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If you aren't playing Paladin, you're doing it wrong.
At the start of your next turn, ALL your minions get buffed +1/+1 permanently. This card has potential especially in the more aggroey decks where the effect will really turn the damage AND survivability up to a full board of tokens/cheap minions
Cool card. Not a huge fan of secrets, would rather see more control cards, but this seems quite useful. Love having Defender of Argus in Paladin, and this gives the +1/+1 to everything. Pretty nice. Got two Secretkeepers in waiting.
Note: This does not trigger if you control no minions. Thus, it's entirely possible (and perhaps even a good strategy!) to play this on turn 1 followed by a coined Muster for Battle on 2, then have this trigger on 3.