You may
activateTo activate an activated ability is to put it onto the stack and pay its costs, so that it will eventually resolve and have its effect. Only an object’s controller (or its owner, if it doesn’t have a controller) can activate its activated ability unless the object specifically says otherwise. A player may activate an ability if they have priority. See rule 602, “Activating Activated Abilities.” (CR 701.2) abilities of creatures you control as though those creatures had
hasteHaste is a static ability.
If a creature has haste, it can attack even if it hasn’t been controlled by its controller continuously since their most recent turn began. (See rule 302.6.)
If a creature has haste, its controller can activate its activated abilities whose cost includes the tap symbol or the untap symbol even if that creature hasn’t been controlled by that player continuously since their most recent turn began. (See rule 302.6.)
Multiple instances of haste on the same creature are redundant. (CR 702.10).
+1:
UntapTo untap a permanent, rotate it back to the upright position from a sideways position. Only tapped permanents can be untapped. (CR 701.26) up to one target creature.
−2:
MillFor a player to mill a number of cards, that player puts that many cards from the top of their library into their graveyard.
A player can’t mill a number of cards greater than the number of cards in their library. If given the choice to do so, they can’t choose to take that action. If instructed to do so, they mill as many as possible. Similarly, the player can’t pay a cost that includes milling a number of cards greater than the number of cards in their library.
An effect that refers to a milled card can find that card in the zone it moved to from the library, as long as that zone is a public zone.
Some spells and abilities mill a single card and then ask for information about the milled card. If more than one card is milled due to replacement effects and the effect of a spell or ability asks for information about the milled card, such as a characteristic or mana value, it gets information from each milled card and will get multiple answers. If these answers are used to determine the value of a variable, the sum of the answers is used. If that effect grants a player permission to cast or play “that” card, the permission applies to each of the milled cards. If that effect performs any actions on “the” card, it performs that action on each milled card. If that effect performs any actions on “a” card, the controller of the spell or ability chooses which card is affected. (CR 701.17) three cards, then you may return a creature card with mana value 2 or less from your graveyard to the battlefield.