mtg chance of drawing a card in opening hand The probability EDH you your 2 combo and at least 2 land in your starting with 6 mulligans is 1 in 100 MTG Hypergeometric Calculator — Draw

Umbra armor's effect is applied no matter why the enchanted creature would be destroyed: because it's been dealt lethal damage, or because it's being affected by an effect that says to "destroy" it (such as Nekrataal's triggered ability)

Perhaps even better is when you do this trick on turn 4, which lets you surprise your opponent with a Chandra, Flamecaller a turn early

Exiling a spell and casting it later adds extra value, especially since mana of any color can be used to play it

Its used to keep threats under control, to interrupt combos, and to prevent players from snowballing out of control

Such as

Red comes from Mountains, Green comes from Forests, and Black comes from Swamps