Phantom Soldier is the strongest magic monster in the death team. Though he cost 8 mana to use at matches he's the best card to use against water team because he decreases magic attack of all opponent's magic monsters. Reasons to max out this card are high health, void ability to protect him from magic attacks, flying ability to help him against range and melee attacks, high magic attack to take down enemies as fast as possible, normal speed, ability to decrease enemy's magic attack. Reason for not using this card is he cost 8 mana. I use this card usually at high mana capped matches.
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From @restlessfighter