Echoes of Eternity + Kozilek's Unsealing + Ulalek, Fused Atrocity

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Overview

When you cast a colorless Eldrazi creature spell while you control Echoes of Eternity, Kozilek's Unsealing, and Ulalek, Fused Atrocity, Echoes will (1) cause applicable triggered abilities of your colorless permanents to trigger an additional time, and (2) cause Echoes itself to produce a copy of the spell (and that copy can be further copied later). Ulalek’s triggered ability(s) (doubled by Echoes) can, when they resolve and you pay their optional cost, copy all spells you currently control (including copies on the stack) and then copy other activated and triggered abilities you control, putting those copies onto the stack [601.2h] [706.10] [117.12].

The StackRules & CitationsDetails & Edge Cases

Step 1

You announce casting the colorless Eldrazi creature spell; once casting completes, triggered abilities that trigger 'when you cast' a spell trigger at that time [601.2h].

Step 2

Echoes of Eternity’s static line causes any triggered ability of a colorless permanent you control that would trigger (for example Kozilek’s Unsealing’s 'Whenever you cast a creature spell...' and Ulalek’s 'Whenever you cast an Eldrazi spell...') to trigger an additional time, and Echoes’ own 'Whenever you cast a colorless spell, copy it.' triggered ability also gets an additional trigger because Echoes is itself a colorless permanent you control.

Step 3

All of those triggers are put on the stack (you choose ordering among your controlled triggers where applicable).

Step 4

When an Echoes 'copy the spell' trigger resolves it creates a copy of the creature spell on the stack; that copy is not cast (it’s a copy on the stack) and when/if it resolves it will become a token permanent if it’s a permanent spell [706.10].

Step 5

When an Ulalek triggered ability on the stack resolves, you may pay as part of its resolution (this is a cost paid during resolution) [117.12]. If you do, the ability first copies all spells you control, which includes the original spell and any copies of that spell currently on the stack; those copies are created and put onto the stack immediately [706.10].

Step 6

After copying spells, the same Ulalek resolution copies all other activated and triggered abilities you control and puts those ability copies onto the stack. The copies have the same sources as the originals and may have new targets chosen because Ulalek’s instruction allows choosing new targets for the copies [706.10] [706.10c] [706.10b].

Step 7

Kozilek’s Unsealing only triggers based on spells actually cast. Because copies of a spell are not cast, they do not themselves cause Kozilek’s 'Whenever you cast...' triggers — only the original casting does (although Echoes doubled that original trigger) [706.10] [601.2h].

Step 8

When any copied permanent spells resolve they become token permanents; if multiple legendary tokens with the same name enter under your control, the legend rule will force you to keep only one [706.10] [704.5k].

Resolution

Sequence and net result: when you cast the colorless Eldrazi spell, Echoes’ static effect makes each triggered ability that is a triggered ability of a colorless permanent you control trigger an additional time (so Kozilek’s Unsealing’s relevant trigger(s) and Ulalek’s trigger(s) are doubled), and Echoes’ own “Whenever you cast a colorless spell, copy it.” ability will trigger an additional time (so you get two Echoes copy triggers). Those Echoes copy triggers each create copies of the creature spell on the stack when they resolve (copies are not cast) [601.2h] [706.10]. Each Ulalek trigger on the stack may resolve; each resolution gives you the option to pay as part of its resolution [117.12]. If you do, that Ulalek resolution will (a) copy all spells you control (this includes the original spell and any copies of it currently on the stack) by creating additional spell copies on the stack [706.10], and then (b) copy all other activated and triggered abilities you control by putting copies of those abilities onto the stack; those ability copies have the same source as the originals and may use the “choose new targets” option Ulalek provides [706.10] [706.10b]. Kozilek’s Unsealing will only trigger from the act of casting the original spell (copies of the spell on the stack are not cast and therefore do not cause Kozilek to trigger) [706.10]. Finally, when copies of a permanent spell resolve they become tokens; if multiple legendary permanents enter under your control with the same name the legend rule will require you to keep only one [706.10] [704.5k].