A "Gem Mint" 10 graded by trusted experts like PSA, BGS, or CGC can be worth 100x more than a "Near Mint" 7
Night's Whisper
Young Hero Enchantment Aura Role Enchant creature Enchanted creature has "Whenever this creature attacks, if its toughness is 3 or less, put a +1/+1 counter on it." Virtuous Enchantment Aura Role Enchant creature Enchanted creature gets +1/+1 for each enchantment you control
If you're worried about a board wipe like Ritual of Soot, Tend the Pests only gives you 1/1s, but A: that's more than enough damage to kill every player at the table many times over, and B: They gain you life when they die
If you would pay life while you control Ashiok and your library does not have at least that many cards in it, you'll just pay life as normal
Single or multiple color channels can have the incorrect ink consistency, have something obstruct the channel (like a splotch), or have the rubber rollers not properly cleaned between passes resulting in all sorts of neat misprints, which I cover in the beginners guide to misprints