Let's say I just mutated an Auspicious Starrix onto a mutated amalgam that's already mutated three times, meaning I get four permanents from the Starrix's ability. The four permanents I get are two lands and two Phylath, World Sculptors. Of course, the legend rule means I'm not keeping both of them. But the questions I have are:
1. How many Plant tokens do I get (let's say both of those lands brought my basic land count to 6).
2. How many Phylath landfall triggers do I get to pump those Plants up?
With Auspicious Starrix, you put the permanent cards onto the battlefield at the same time (C.R. 608.2c). After you do so, "all permanents on the battlefield (including the newcomers) are checked for any enters-the-battlefield triggers that match the event" (C.R. 603.6a). Thus, each Phylath's last ability will trigger if "a land enters the battlefield under your control", even if that land enters at the same time as that Phylath, and its first ability will trigger if that Phylath enters the battlefield itself, even if it's legendary and has the same name as an existing or incoming legendary permanent (C.R. 603.2, 603.6a). It's only after Auspicious Starrix's ability finishes resolving that the legend rule kicks in (and if you control two or more legendary permanents with the same name, all but one of them of your choice will go to the graveyard) (C.R. 117.3b, 117.5, 704.5j, 704.4, 117.2e; see also this thread and this thread).
1. You check the number of basic lands you control when each Phylath's first ability resolves (even if Phylath isn't on the battlefield anymore) (C.R. 113.7a, 608.2g). Thus, if you control six basic lands at the time, you create six Plant tokens. In this scenario, the total will be twelve Plant tokens assuming all the relevant abilities resolve.
2. In this scenario, each Phylath's last ability will trigger twice (for a total of four times), since two lands have entered the battlefield under your control. After Auspicious Starrix's last ability resolves, you put all abilities you control that just triggered onto the stack in any order (C.R. 117.3b, 603.2b). In this scenario, it's best if you put the "landfall" abilities first on the stack, then those from each Phylath's first ability. Thus, as a result, the twelve Plant tokens will enter the battlefield before they're given four +1/+1 counters each by each "landfall" ability (for a total of sixteen +1/+1 counters per token in this scenario, or one hundred ninety-two in total) assuming all the relevant abilities resolve.
EDIT: Edited after comment 3 was posted. I mis-read "target Plant" on Phylath's last ability as "each Plant".
Regarding 2)
While you will get four landfall triggers as peteroupc said, none of them will remain on the stack long enough to be even responded to, unless you already control a Plant. They are removed immediately upon being put on the stack, because they each require targets, and with no Plants under your control when the triggers are put on the stack, there are no legal targets. That you will get some Plants "real soon" doesn't matter, they are not there yet to be targeted. So the answer is 4 triggers and no counters.
603.3d The remainder of the process for putting a triggered ability on the stack is identical to the process for casting a spell listed in rules 601.2c–d. If a choice is required when the triggered ability goes on the stack but no legal choices can be made for it, or if a rule or a continuous effect otherwise makes the ability illegal, the ability is simply removed from the stack.
601.2c The player announces their choice of an appropriate object or player for each target the spell requires. A spell may require some targets only if an alternative or additional cost (such as a kicker cost) or a particular mode, was chosen for it; otherwise, the spell is cast as though it did not require those targets. Similarly, a spell may require alternative targets only if an alternative or additional cost was chosen for it. If the spell has a variable number of targets, the player announces how many targets they will choose before they announce those targets. In some cases, the number of targets will be defined by the spell’s text. Once the number of targets the spell has is determined, that number doesn’t change, even if the information used to determine the number of targets does. The same target can’t be chosen multiple times for any one instance of the word “target” on the spell. However, if the spell uses the word “target” in multiple places, the same object or player can be chosen once for each instance of the word “target” (as long as it fits the targeting criteria). If any effects say that an object or player must be chosen as a target, the player chooses targets so that they obey the maximum possible number of such effects without violating any rules or effects that say that an object or player can’t be chosen as a target. The chosen objects and/or players each become a target of that spell. (Any abilities that trigger when those objects and/or players become the target of a spell trigger at this point; they’ll wait to be put on the stack until the spell has finished being cast.)
If you do already control one or more Plant, then they altogether will get a total of only 4x4=16 counters.
1. How many Plant tokens do I get (let's say both of those lands brought my basic land count to 6).
2. How many Phylath landfall triggers do I get to pump those Plants up?
1. You check the number of basic lands you control when each Phylath's first ability resolves (even if Phylath isn't on the battlefield anymore) (C.R. 113.7a, 608.2g). Thus, if you control six basic lands at the time, you create six Plant tokens. In this scenario, the total will be twelve Plant tokens assuming all the relevant abilities resolve.
2. In this scenario, each Phylath's last ability will trigger twice (for a total of four times), since two lands have entered the battlefield under your control. After Auspicious Starrix's last ability resolves, you put all abilities you control that just triggered onto the stack in any order (C.R. 117.3b, 603.2b).
In this scenario, it's best if you put the "landfall" abilities first on the stack, then those from each Phylath's first ability. Thus, as a result, the twelve Plant tokens will enter the battlefield before they're given four +1/+1 counters each by each "landfall" ability (for a total of sixteen +1/+1 counters per token in this scenario, or one hundred ninety-two in total) assuming all the relevant abilities resolve.EDIT: Edited after comment 3 was posted. I mis-read "target Plant" on Phylath's last ability as "each Plant".
While you will get four landfall triggers as peteroupc said, none of them will remain on the stack long enough to be even responded to, unless you already control a Plant. They are removed immediately upon being put on the stack, because they each require targets, and with no Plants under your control when the triggers are put on the stack, there are no legal targets. That you will get some Plants "real soon" doesn't matter, they are not there yet to be targeted. So the answer is 4 triggers and no counters.
If you do already control one or more Plant, then they altogether will get a total of only 4x4=16 counters.
Former Rules Advisor
"Everything's better with pirates." - Lodge
(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)
Former Rules Advisor
"Everything's better with pirates." - Lodge
(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)