Phyrexian Tower 7/10 Two mana (or even the effective one that you get) is a whole lot better than one life
The only issue for Delighted Halfling is the existence of Orcish Bowmasters, which can potentially kill it if someone draws more than one card a turn, and another opponent has the opportunity to Flash in Orcish Bowmasters
It was great because it worked well on two fronts: first as graveyard hate and then as a strong reanimation tool
In particular, Elaine wanted the team to create an official Magic product modeled after a casual player-made format called Chaos Magic. Chaos Magic is a free-for-all multiplayer format that was quite popular in 2009
Most of my support legendary are grounded dorks, save for a key four card cycle we'll look at later, so Broodmoth should trigger pretty reliably
The bottom line, however, remains 5/5 for three mana, and in a color combination that both makes him relatively easy to cast and provides a logical support structure