Life and Limb + Sporemound

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Overview

With Life and Limb active, a Forest that enters the battlefield under your control is both a Forest land and a 1/1 green Saproling creature, so Sporemound will see a land entering and its Landfall ability will trigger. Playing a land is a special action (so putting a Forest onto the battlefield by playing it will cause the trigger) [115.2a] [305.1], and official rulings confirm forests enter as land creatures and that Sporemound triggers for lands that enter for any reason [2021-03-19] [2013-07-01].

The StackRules & CitationsDetails & Edge Cases

Step 1

Start with Life and Limb on the battlefield and Sporemound under your control.

Step 2

You play a Forest card (playing a land is a special action and is performed when you have priority during a main phase) [115.2a] [305.1].

Step 3

As the Forest is put onto the battlefield, Life and Limb’s continuous effect makes all Forests also 1/1 green Saproling creatures in addition to being Forest lands (so the entering object is simultaneously a land and a creature) [305.6] and per the official ruling forests enter as land creatures [2021-03-19].

Step 4

Sporemound sees a land entering the battlefield under your control and its Landfall triggered ability triggers; official ruling confirms Sporemound triggers whether the land was played or entered by another effect [2013-07-01].

Step 5

If the trigger resolves, Sporemound’s ability creates a 1/1 green Saproling creature token under your control.

Step 6

Because the entering Forest is also a creature, any abilities that trigger when a creature enters the battlefield will see it as well [2021-03-19].

Step 7

However, the entering Forest/creature is affected by summoning sickness (as noted on Life and Limb’s text and confirmed by ruling), so you can’t tap it for its : Add ability that turn if you haven’t controlled it since the beginning of your turn [2021-03-19] [305.6].

Resolution

If Life and Limb is on the battlefield and a Forest enters under the controller of Sporemound, Sporemound’s Landfall ability triggers and will create a 1/1 green Saproling token. The Forest also enters as a 1/1 Saproling creature (so creature‑entering triggers will see it), but that Forest can’t be tapped for its mana ability that turn if it hasn’t been controlled since the start of your turn per the official ruling [2021-03-19].