how many packs come in a collector booster box Modern Horizons 3 Each Collector Booster contains 15 Magic I'm confused about the collector

You can also browse Land MTG Proxy Cards if mana fixing is your first priority, or look at MTG Proxy Sets if you want grouped staples instead of hunting one card at a time like a goblin with a clipboard

Buying sleeves made for Japanese cards instead of English cards is a very common mistake

It's the type of card you don't want to play against

Binders can even be used to hold a large number of cards, as long as you get one that's big enough

There's quite a few abilities, so I'd recommend taking a look at the card itself, because you probably forgot at least one of its abilities like the ability to deal damage to a planeswalker when it deals combat damage to a player so be sure to keep a copy handy just in case