It is a bear as a baseline, and it can get bigger if it has enough friends
On a serious note, understanding how ETB effects can add extra value to your builds is crucial
If your primary goal is to play casual games of Magic but you don't want (or have the ability) to spend even the heavily played price for a "real" Underground Sea, Wheel of Fortune, or [insert Reserved List card here], just make one yourself
I guess that lady in Counterspell is Gustha Ebbasdotter, who shows up a lot in the Ice Age flavour texts
Not only will it give a good buffer but it gives you more options in how you play, throw it down early and just fight the tempo directly or bait them into over extending by holding back the Finks
Many games went Man-o'-War your turn 3 creature, Man-o'-War your same creature on turn 4, Undo your same creature and one of my Man-o'-Wars on turn 5, Man-o'-War the creature yet again on turn 6