If an artifact or creature entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

When you speak, sacrifice this creature.

Flash
At the beginning of your end step, draw seven cards.
Each opponent's maximum hand size is reduced by seven.

Reach, vigilance, trample
Whenever this creature attacks or blocks, choose one —
• Create a 3/3 green Beast creature token.
• You gain 3 life.
• Draw a card.

Eluge's power and toughness are each equal to the number of Islands you control.
Whenever Eluge enters or attacks, put a flood counter on target land. It's an Island in addition to its other types for as long as it has a flood counter on it.
The first instant or sorcery spell you cast each turn costs (or ) less to cast for each land you control with a flood counter on it.

Protection from black
This creature enters with three +1/+1 counters on it.
If damage would be dealt to this creature, prevent that damage. Remove a +1/+1 counter from this creature.

Black spells you cast cost less to cast.

You have no maximum hand size.

When this creature enters, creatures your opponents control get -2/-2 until end of turn.
Whenever a creature an opponent controls dies, that player loses 2 life.

: Add .
, : Target creature gains protection from artifacts until end of turn.

First strike
When this creature enters, if an opponent controls more lands than you, you may search your library for a Plains card, put it onto the battlefield, then shuffle.

This land enters tapped unless you control a Mountain or a Forest.
: Add .
, : The next spell you cast this turn can't be countered.

Destroy all creatures. They can't be regenerated.

Double strike
Master Tactician — Whenever one or more tokens you control enter, draw a card.
Chapter Master — : Create two 2/2 white Astartes Warrior creature tokens with vigilance.

Menace
Whenever one or more creatures you control deal combat damage to a player, create a Treasure token.
Sacrifice a Treasure: Exile the top card of your library. You may play that card this turn.

Ward
Whenever you attack, look at the top six cards of your library. You may cast a spell from among them with mana value less than or equal to the greatest power among attacking creatures you control without paying its mana cost. Put the rest on the bottom of your library in a random order.

: Add .
, : Add , , or .

When Exdeath enters, you gain 3 life.
At the beginning of your end step, if there are six or more permanent cards in your graveyard, transform Exdeath.

Flying
When Aerid Konstrari enters or dies, create a Heartwood token. (It's a red and green artifact with ": Add or .")
: Create a Heartwood token. Then Aerid Konstrari gets +X/+0 until end of turn, where X is the number of artifacts you control.

: Add .
, , Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.