A number of them already reward you for playing Humans, like Heronblade Elite and Angel of Glorys Rise
This spell costs less to cast if it targets a spell or ability that targets a creature you control with power 7 or greater
The haste is a great addition as well
(1/1/2006) You must still follow any restrictions on when you can cast the spell, such as "cast only during combat" or "cast only on your own turn." (2/1/2006) When a spell with Replicate is copied by Eye of the Storm, you have the opportunity to pay additional costs, so you may Replicate as much as you like (assuming you have the mana available).
This is a Common item.
Landcycling - Landcycling abilities, seen on cards with a basic land type such as plainscycling, islandcycling, swampcycling, and so on, allow you to discard a card to search your library for a card with the specified land type