Since it triggers whenever a Human dies, not one or more, Laid To Rest draws a card for each Human that died
Then exile it.) "Flashback [cost]" means "You may cast this card from your graveyard if the resulting spell is an instant or sorcery spell by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack." You must still follow any timing restrictions and permissions, including those based on the card's type
It gains First Strike and Lifelink until end of turn
However, with Rhystic Study on your side, you should have no trouble drawing into an answer for whatever new threats are sent your way
It performs well as the large finishing creature in an aggro deck that wants to get in quickly and attack, but because it creates treasure it also has a key role to play in controlling decks that can make use of the extra mana it provides
When building a deck, players can cater it to their own personal play style