Elesh Norn, Mother of Machines increases the value of your permanent-entry triggers while shutting down many of the same triggers for opponents. When a permanent entering causes an ability of your permanent to trigger, that ability triggers an additional time. Permanents entering do not cause abilities of opposing permanents to trigger, creating a strong advantage for a white deck built around entry effects.
Solemn Simulacrum can search for an additional land, and Stoneforge Mystic can provide another Equipment search. Token decks can use creatures with entry-based token production to expand their boards further. Landfall abilities also qualify when a land entering causes the relevant trigger, so the card reaches beyond creatures that have an ability printed as their own entry effect.
The distinction between triggered abilities and replacement effects matters. A creature entering with counters does not automatically receive twice as many counters, and an ability that applies as a permanent enters is not simply another trigger. Opposing cast triggers also remain available, since they are caused by casting a spell rather than by a permanent entering.
At five mana, Elesh Norn is most productive when you can follow her with an entry effect immediately or already have a repeated-entry engine. Her vigilance and substantial toughness help on the battlefield, but she can still be removed by ordinary answers. Build with cards that remain useful without her so the deck retains its value plan when the multiplier is unavailable.






