Nobody is buying Talas Warrior to put in a deck, so selling it is extremely difficult compared to a card of high demand with a relatively equal price, like Mystic Remora
Illustrated by Zezhou Chen Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
I could toss in Sol Rings and Lightning Greaves and Swords to Plowshares and Eternal Witnesses and Solemn Simulacrums all day long
Choco-Comet Choco-Comet is a pretty solid base case of what a fireball is in MTG: You sink as much mana as you can into it, you deal X to any one target that can be damaged (players, creatures, planeswalkers, or battles)
This doesnt do anything extra, is very easy to predict and keep account of by your opponents, and the scope of its benefits is far too narrow to be useable
If the triggered ability can't determine the information it needs, or if it can't find the objects it expects to find in certain zones, those parts of the effect just do nothing