One can maximize the battlecry by consuming minions which are under temporary buffs, e.g. Dark Iron Dwarf's battlecry, or who would most certainly die on the next round, e.g. a minion under the effects of a Corruption card.
A play, combining these two ideas, is to buff an own minion with Power Overwhelming, attack/trade with it, and then consume the empowered minion using Void Terror's battlecry. The temporary +4/+4, the minions attack, and its remaining health will live on in the Void Terror, instead of being removed from the game.
|Power Overwhelming||Common||Warlock||Spell||General||1||Give a friendly minion +4/+4 until the end of turn. Then, it dies. Horribly.|
|Dark Iron Dwarf||Common||Neutral||Minion||General||4||4||4||Battlecry: Give a minion +2 Attack this turn.|
|Abusive Sergeant||Common||Neutral||Minion||General||1||2||1||Battlecry: Give a minion 2 Attack this turn.|
|Abusive Sergeant||Common||Neutral||Minion||General||1||2||1||Battlecry: Give a minion +2 Attack this turn.|
|Ancient Watcher||Rare||Neutral||Minion||General||2||4||5||Can't Attack.|