its almost always played alongside Ancient Tomb and does much of the same work, at a different cost
It highlights how the Pokmon card market can be cyclical at one point Japanese exclusive cards (like certain Full-Art trainer cards featuring popular characters) were spiking in price, then the attention swung to English sets and those saw price booms
If the target creature's power is no longer less than the attacking creature's power as the ability resolves, mentor doesn't add a +1/+1 counter
This synergy is fantastic because Coatls are very good at leading to a stall where the opponent would rather not trade a creature for them and chooses to just cast more creatures while waiting to draw a removal spell, and then you can really punish them with Dead of Winter
Polymorph swaps creatures for strong ones
Light-Paws, Emperors Voice is more all-in on Auras, but it can assemble devastating combos that make it impossible to kill, whereas Sram, Senior Edificer is a more general Voltron commander that can keep itself going with nothing but the types of spells the deck wants to cast anyway
