Lands on the battlefield and land cards in graveyards can’t be the targets of spells or abilities your opponents control.
Your opponents can’t play land cards from graveyards.
Fall of the Thran's text:
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Destroy all lands.
II, III — Each player returns two land cards from their graveyard to the battlefield.
So this happens:
1. I play Tomik and the card stays on the battlefield
2. I play Fall of the Thran
3. All lands are destroyed
4. Next turn Fall of the Thran gets a second lore counter
5. Fall of the Thran's triggered ability: Each player returns two land cards from their graveyard to the battlefield. hits the stack
6. Does Tomik's static ability prevent my opponent from returning two lands from their graveyard to the battlefield?
No; despite Tomik, your opponent will still return two land cards from their graveyard to the battlefield when Fall of the Thran's "II, III" ability resolves (and they choose which land cards to return this way, or they return all of them this way if fewer are two are in their graveyard [C.R. 609.3]). Fall of the Thran's "II, III" ability doesn't target anything (it lacks the word "target", for example [C.R. 115.1d, 714.2a-c]) (C.R. 115.10a), and putting a land card onto the battlefield is not the same as playing a land (C.R. 701.13a).
Does Tomik's static ability prevent my opponent from returning two lands from their graveyard to the battlefield?
Neither of its static abilities will interfere with the saga.
"Lands on the battlefield and land cards in graveyards can't be the targets of spells or abilities your opponents control." will not interfere because there is no target (and because your opponent doesn't control the saga and its abilities).
115.10. Spells and abilities can affect objects and players they don’t target. In general, those objects and
players aren’t chosen until the spell or ability resolves. See rule 608, “Resolving Spells and
Abilities.”
115.10a Just because an object or player is being affected by a spell or ability doesn’t make that
object or player a target of that spell or ability. Unless that object or player is identified by the
word “target” in the text of that spell or ability, or the rule for that keyword ability, it’s not a
target.
"Your opponents can't play land cards from graveyards." will not interfere because no one is playing a land.
701.13. Play
701.13a To play a land means to put it onto the battlefield from the zone it’s in (usually the hand).
A player may play a land if they have priority, it’s the main phase of their turn, the stack is
empty, and they haven’t played a land this turn. Playing a land is a special action (see rule 116),
so it doesn’t use the stack; it simply happens. Putting a land onto the battlefield as the result of a
spell or ability isn’t the same as playing a land. See rule 305, “Lands.”
Private Mod Note
():
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Why bother with mere rulings when so many answers can be found in the Rules?
tomik, distinguished advokist and fall of the thran
Tomik's Text:
Lands on the battlefield and land cards in graveyards can’t be the targets of spells or abilities your opponents control.
Your opponents can’t play land cards from graveyards.
Fall of the Thran's text:
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Destroy all lands.
II, III — Each player returns two land cards from their graveyard to the battlefield.
So this happens:
1. I play Tomik and the card stays on the battlefield
2. I play Fall of the Thran
3. All lands are destroyed
4. Next turn Fall of the Thran gets a second lore counter
5. Fall of the Thran's triggered ability: Each player returns two land cards from their graveyard to the battlefield. hits the stack
6. Does Tomik's static ability prevent my opponent from returning two lands from their graveyard to the battlefield?
[c]Fall of the Thran[/c] -> Fall of the Thran
Neither of its static abilities will interfere with the saga.
"Lands on the battlefield and land cards in graveyards can't be the targets of spells or abilities your opponents control." will not interfere because there is no target (and because your opponent doesn't control the saga and its abilities).
"Your opponents can't play land cards from graveyards." will not interfere because no one is playing a land.