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The conditions for this [On Play] [When Digivolving] effect require you to place the specified number of cards as the bottom digivolution cards

Last and least, you get the itty-bitty text just above the border which says "135/306" meaning the Troll is card number 135 out of the 306 cards in Mirrodin

It can work especially well with Thassa, Deep-Dwelling, giving you a chance to proliferate multiple times each end step

As for Dora Dora, despite being a good card, it competes for a slot with Tenpai Dragon Paidra (the main normal summon in this deck), and probably won't be very popular in the main decklists at more relevant tournaments

The Computer Search card from the Boundaries Crossed expansion fits both of those criteria