It says, "Whenever a creature an opponent controls becomes tapped, if it isnt being declared as an attacker, you may draw a card." This means whenever Llanowar Elves taps for mana, Anje Falkenrath activates in her Madness tribal deck, Blossom Dryad untaps target land, the list could go on
We pair that with political cards that encourage our opponents to attack each other, keeping our life total high while indirectly lowering our opponents' life totals, until we're ready to finish off our opponents with a lethal attack
Whenever you reveal a nonland card this way, Keranos deals 3 damage to any target
Blocker: When the opponent attacks, rest the card with this ability and change the attack target to that card
Take these with a grain of salt
Enchantment creatures you control have deathtouch, lifelink, and hexproof