Whenever The Boulder attacks,
earthbend“Earthbend N” means “Target land you control becomes a 0/0 land creature with haste in addition to its other types. Put N +1/+1 counters on it. When that land dies or is put into exile, return it to the battlefield tapped under your control.”
An ability that triggers whenever a player earthbends triggers when the delayed triggered ability described in rule 701.66a is created. (CR 701.66) X, where X is the number of creatures you control with power 4 or greater. (Target land you control becomes a 0/0 creature with
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) that's still a land. Put X +1/+1
countersTo counter a spell or ability is to cancel it: remove it from the stack without resolving it. A counter on an object or player is instead a marker that changes characteristics or interacts with rules or abilities; for example, a +1/+1 counter modifies a creature’s power and toughness. (CR 701.6; 122.1) on it. When it
diesIs put into a graveyard from the battlefield. (CR 700.4) or is exiled, return it to the battlefield tapped.)