For example, if you put Necrodominance (an enchantment that says your maximum hand size is five) onto the battlefield and then activate Tamiyo, Seasoned Scholar's last ability, you'll have no maximum hand size
While I would normally be opposed to such an idea, I took the time to put myself in their shoes
Greed You'd always, always want Greed if it didnt cost 4 to get down
The effect of (3) only corresponds to the later-mentioned Competitive and Revival, but since Revival has activation conditions, the benefit of placing it with this card is thin, so it is exclusively for Competitive
Ease of transport As well a storing your cards safely, you may also want to carry some of them around to trade with other players, so its common for players to keep certain cards separately to their main collection for ease of transport