Mercenary Informer [Prophecy] 227 that monster you control cannot

that monster you control cannot be destroyed by that battle

Set: Ice Age Type: Creature — Human Knight Rarity: Rare Cost: {2}{W}{W} As Lost Order of Jarkeld enters the battlefield

or Special Summoned from your Extra Deck by Tributing the above cards you control (in which case you do not use "Polymerization")

a harbinger of doom

while this card is in your hand: You can Special Summon this card

Mercenary Informer [Prophecy] 227 that monster you control cannotSet: Prophecy Type: Creature Human Rebel Mercenary Rarity: Rare Cost: {2}{W} Mercenary Informer can't be the target of black spells or abilities from black sources. {2}{W}: Put target nontoken Mercenary on the bottom of its owner's library. The problem with rebels is that they so quickly reject authority.