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)
LandfallAn ability word has no rules meaning of its own. It groups abilities with similar themes; the text following it explains this card’s effect. (CR 207.2c) — Whenever a land you control enters, this creature gains
battle cryBattle cry is a triggered ability. “Battle cry” means “Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.”
If a creature has multiple instances of battle cry, each triggers separately. (CR 702.91) until end of turn. (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn. Each instance of
battle cryBattle cry is a triggered ability. “Battle cry” means “Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.”
If a creature has multiple instances of battle cry, each triggers separately. (CR 702.91) triggers separately.)