Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.)

Defender, flying
: Creatures you control with defender can attack this turn as though they didn't have defender.

Defender (This creature can't attack.)
Walking Archive enters the battlefield with a +1/+1 counter on it.
At the beginning of each player's upkeep, that player draws a card for each +1/+1 counter on Walking Archive.
: Put a +1/+1 counter on Walking Archive.

Whenever an opponent taps a land for mana, tap all lands that player controls.
If a creature an opponent controls attacks, all creatures that opponent controls attack if able.

Weight of Spires deals damage to target creature equal to the number of nonbasic lands that creature's controller controls.

When Whiptail Moloch enters the battlefield, it deals 3 damage to target creature you control.

Flying
: Windreaver gains vigilance until end of turn.
: Windreaver gets +0/+1 until end of turn.
: Switch Windreaver's power and toughness until end of turn.
: Return Windreaver to its owner's hand.

Target player discards their hand.

Destroy target creature or land.

Enchant creature
Whenever enchanted creature attacks, if its power is 2 or less, it can't be blocked this turn.
Forecast — , Reveal Writ of Passage from your hand: Target creature with power 2 or less can't be blocked this turn. (Activate this ability only during your upkeep and only once each turn.)