The most effective and simplest way to use Courtesan Thais is to cast her while your opponent is on Deaths Door so that way you can cast their damage spell to end the game, or you can simply force their avatar to attack your unit resulting in their avatar taking the final point of damage to end the game
Remember that if you want unique backs for the cards in your deck, you'll need to create a mirroring deck with those back designs and then check the Unique Backs option in the import dialog
Use online stores, your local communities, vendors at large events, and local marketplaces to get good deals on all the boxes you need for speculating, improving at Sealed, or playing with friends
We also get to mill ourselves, which, in the right deck or even the right format, is akin to drawing three cards anyway
With Gretchen Titchwillow, you can do both
In a perfect turn, the creature equipped with this could gain four or more counters depending on the spells cast