"I will never run out of new oceans to explore or new sea-dwellers to embrace as my own."
—Kiora

「私が探検するべき新たな海洋と、同胞として受け入れるべき新たな海中の住人達が尽きることはないわ。」
――キオーラ

探検

このターン、あなたは追加で土地を１つプレイしてもよい。
カードを１枚引く。

Explore

You may play an additional land this turn.
Draw a card.

As he crested the final peak, Nidd gasped at the beauty laid out before him. Finally, he had found a place to rest his weary legs. A place to call home.

Foundations Jumpstart

Bloomburrow Commander

An explorer's reward is a view of tomorrow's possibilities.

Outlaws of Thunder Junction Commander

Secret Lair Showdown

The Lost Caverns of Ixalan Commander

Explore's effect allows you to play an additional land during your main phase. Doing so follows the normal timing rules for playing lands. In particular, you don't get to play a land as Explore resolves; Explore fully resolves first and you draw a card, perhaps a land you'll play later.

If you somehow manage to cast Explore when it's not your turn, you'll draw a card when it resolves, but you won't be able to play a land that turn.

The effects of multiple Explores in the same turn are cumulative. They're also cumulative with other effects that let you play additional lands, such as the one from Urban Evolution.