Let's come back to the text: postcombat main phase isn't this main phase where you want to play many of your spells anyway
Dig through random piles of junk, take the blue instants/sorceries, add Islands, and voila
Here are a few good examples of some cheaper creatures already in Red, that I have run with Pygmy Giant
As always, none of these cards are required to play the TCG
You play lands, creatures, and sorceries during your main phases, announce attackers, pass your turn, and play the exact same way youd play a normal game of Magic
Its the first extension to be released in both Europe and US and its still an easy one to collect, even if some cards will be quite expensive but they are findable, not like some series released after this one