Typal decks are really popular, especially in Commander, so WotC is always releasing new typal cards to strengthen the existing archetypes or to create new ones entirely
If that creature is a legal target but the other creature isn't, you'll still put the +1/+1 counter on the creature you control
No completed sales can be found yet on eBay either, although several listings for sale have it ranging anywhere from $3,500 to $10,000
For example, if you put Twenty-Toed Toad onto the battlefield and then put Spellbook (an artifact that says you have no maximum hand size) onto the battlefield, you would have no maximum hand size
Whenever a creature with power 2 or less enters the battlefield under your control, you get to draw a cardbut only once per turn, so timing matters