mtg card lists Effects Guide : r/mtg draw cards equal to the difference. Where can I find a

No, because the card should read, "Any one creature gets +2/+2 and gains horsemanship until end of turn." At the release of the set, this card said that the bonus was permanent, but the FAQ stated that it was, in fact, just another end of turn sorcery

Of the four creatures that grow when an opponent casts a spell, Forgotten Ancient is barely edged out by the rest

Card Name Mana Cost Type Legendary Creature Human Artificer Noble Rarity Rare rules Text When Edgar enters, draw a card for each artifact you control

Your six-mana investment nets you a 7/6 dork, so he's on-curve and will kill in three Commander damage hits