When you lose control of that Equipment this turn, if it's attached to a creature you control, unattach it
Green creatures and spells can generate life points and mana, and can also gain massive strength through spells
With Gwendlyn, the issue was likely more the art than the card itself, which has been known for being fairly racy by Magic standards
Notably, Alandras abilities happen each turn, not just during your turn, so drawing multiple cards on an opponents turn, such as with Thirst for Discovery, can be an effective strategy
Uril is so nasty with a trample granting Aura like Rancor or a flying Aura in White, or unblockable Equipment like Prowler's Helm
There are literally volumes that could be (and have been) written about what constitutes an efficient creature in Limited and how highly you should pick certain cards over others