Loxodon Smiter can't be countered.
If a spell or ability an opponent controls causes you to discard Loxodon Smiter, put it onto the battlefield instead of putting it into your graveyard.

Flying
When Lyev Skyknight enters the battlefield, detain target nonland permanent an opponent controls.

As Breeding Pool enters the battlefield, you may pay 2 life. If you don't, Breeding Pool enters the battlefield tapped.

As Hallowed Fountain enters the battlefield, you may pay 2 life. If you don't, Hallowed Fountain enters the battlefield tapped.

Selesnya Guildgate enters the battlefield tapped.
: Add or to your mana pool.

As Temple Garden enters the battlefield, you may pay 2 life. If you don't, Temple Garden enters the battlefield tapped.

Evolve
: Add to your mana pool for each +1/+1 counter on Gyre Sage.

When Centaur Healer enters the battlefield, you gain 3 life.

Simic Guildgate enters the battlefield tapped.
: Add or to your mana pool.

Trample
When Armada Wurm enters the battlefield, put a 5/5 green Wurm creature token with trample onto the battlefield.

You gain X life and draw X cards.

Azorius Guildgate enters the battlefield tapped.
: Add or to your mana pool.

Whenever another creature enters the battlefield under your control, you gain life equal to that creature's toughness.
, : Populate.

Prime Speaker Zegana enters the battlefield with X +1/+1 counters on it, where X is the greatest power among other creatures you control.
When Prime Speaker Zegana enters the battlefield, draw cards equal to its power.

Draw three cards. You may play an additional land this turn.

When Detention Sphere enters the battlefield, you may exile target nonland permanent not named Detention Sphere and all other permanents with the same name as that permanent.
When Detention Sphere leaves the battlefield, return the exiled cards to the battlefield under their owner's control.

Flying
When Angel of Serenity enters the battlefield, you may exile up to three other target creatures from the battlefield and/or creatures cards from graveyards.
When Angel of Serenity leaves the battlefield, return the exiled cards to their owner's hands.

Choose one - Target creature gets +2/+2 and gains trample until end of turn; or exile target creature with power 5 or greater; or put a 2/2 white Knight creature token with vigilance onto the battlefield.

Defender
When Gatecreeper Vine enters the battlefield, you may search your library for a basic land card or a Gate card, reveal it, put it into your hand, then shuffle your library.

Counter target instant spell.

Counter target spell unless its controller pays . If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Supreme Verdict can't be countered.
Destroy all creatures.