Use device-level protections: PIN or biometric lock, updated OS, and trusted WiFi
Arbor Elf has seen a fair amount of competitive play, often alongside Utopia Sprawl
With both of these creatures, attacking opponents with large board states shouldnt pose much of a problem
(It can't be blocked, targeted, dealt damage, enchanted, or equipped by anything controlled by those players.) Fateful hour If you have 5 or less life, you can't lose life this turn, you can't lose the game this turn, and your opponents can't win the game this turn
While shes not an early-game character (requiring five Ink to bring onto the field), her six Strength and four Willpower more than make up for it
1 Irenicus's Vile Duplication