Ertai's Familiar [Weatherlight] Giant Soldier you may put its +1/+1

you may put its +1/+1 counters on target artifact creature

Set: Revised Edition Type: Instant Rarity: Uncommon Cost: {W} Exile target creature

Set: Eighth Edition Type: Enchantment — Aura Rarity: Uncommon Cost: {U} Enchant creature

Those creatures have "This creature's power and toughness are each equal to the number of creature cards in its controller's graveyard

Set: Wizards Play Network 2009 Type: Instant Rarity: Rare Cost: {W} Exile target creature

Ertai's Familiar [Weatherlight] Giant Soldier you may put its +1/+1Set: Weatherlight Type: Creature Illusion Rarity: Rare Cost: {1}{U} Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.) When Ertai's Familiar phases out or leaves the battlefield, mill three cards. {U}: Until your next upkeep, Ertai's Familiar can't phase out.