More Interaction A more precise callback to Power Sink, frost armor is a pre-keyworded ward named after its first card appearance on Frost Titan
Kozileks triggered ability of shuffling the graveyard into the library would go on the stack, at which point you could respond and yoink Kozilek before it gets shuffled
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Cast it for X = 5 and, because it doubles all the +1/+1 counters on it every Upkeep, the next turn you have a Trampling 10/10 to send at someone
Both of which are things this deck does incredibly well
Each of these provides a great way to generate some sacrificial value towards Hearthull's damage dealing ability
