Red and blue work excellent together because you can get your smaller red creatures out faster while preventing the opponent's stronger creatures from coming to the battlefield
It fuels these threats with a flurry of one-mana spells and efficient card draw, allowing Cori-Steel Cutter to flood the battlefield with an ever-growing tide of Monk tokens
From there, its usually correct to keep a low curve with multiple 1- or 2-mana cards and a few 3-drops, and your 4-mana cards like Chandra, Torch of Defiance should be your more impactful threats or win conditions
There are two very simple reasons why this land is so valuable: it was only printed in one set, Arabian Nights, making it a part of the Reserved List, a collection of cards from Magics early days that the company has promised never to reprint
Counters Matter Counters matter decks care about +1/+1 counters, -1/-1 counters, Loyalty counters, Charge counters, or even Shield Counters if you got them
March of the World Ooze doesn't create ooze tokens, but rather creates big oozes out of your other creatures, though it is still good with Doubling Season