Creatures entering the battlefield don't cause abilities to trigger.

Flash
When Torrential Gearhulk enters the battlefield, you may cast target instant card from your graveyard without paying its mana cost. If that spell would be put into your graveyard this turn, exile it instead.

Creatures you control gain shroud until end of turn. (They can't be the targets of spells or abilities.)

At the beginning of your upkeep, put a pain counter on Torture Chamber.
At the beginning of your end step, Torture Chamber deals damage to you equal to the number of pain counters on it.
, , Remove all pain counters from Torture Chamber: It deals damage to target creature equal to the number of pain counters removed this way.

Put target nonland permanent on top of its owner's library.

When Totem-Guide Hartebeest enters the battlefield, you may search your library for an Aura card, reveal it, put it into your hand, then shuffle your library.

Draw two cards.

Target creature can't be blocked this turn.
Draw a card.

At the beginning of your upkeep, count the number of permanents you control. Your life total becomes that number.

Whenever a Minotaur attacks this turn, it gains deathtouch until end of turn.

: Tap target artifact you don't control.

Whenever an opponent casts a spell, Tovolar's Magehunter deals 2 damage to that player.
At the beginning of each upkeep, if a player cast two or more spells last turn, transform Tovolar's Magehunter.

( can be paid with any two mana or with . This card's converted mana cost is 6.)
Until end of turn, target creature gets +4/+4 and gains trample, wither, and "When this creature attacks, target creature blocks it this turn if able." (It deals damage to creatures in the form of -1/-1 counters.)

Flying
: Tower Drake gets +0/+1 until end of turn.

Flying
When Tower Geist enters the battlefield, look at the top two cards of your library. Put one of them into your hand and the other into your graveyard.

, : Tower of Calamities deals 12 damage to target creature.

, : Target creature gets +6/+6 until end of turn.

: Target creature can't be blocked by Walls this turn.

, : You gain 10 life.

, : Draw four cards.