For challenges like Challenge # 108. Chunks of the custom card community around the internet have (vaguely) agreed translations of quite a large number of MtG terms into StC, but the sites those translations are hosted on do sometimes disappear off the internet. So I'm mirroring the last updated dictionary here.

Source: http://www.mtgsalvation.com/forums/the-game/the-cube-forum/190847-space-cube?comment=13

TERMS/OBJECTS

• Ability = Protocol
• Activated ~ = Initiated ~
• Triggered ~ = Automatic ~
• Black = Shadow
• Blue = Cryo
• Cast - [Issue]
• Color = Alignment
• Combat damage = Battle damage
• Emblem = Diploma
• Green = Xeno
• Is indestructible = Is invulnerable
• Is unblockable = Can't be intercepted
• Life = Control
• Life total = Total control
• Mana = Psi
• Mana pool = Psi cache
• Permanent = Entity
• Red = Pyre
• Spell = Order
• Toughness = Durability
• White = Crystal

ZONES

• Battlefield = Warzone (on the battlefield = in the warzone)
• Hand = Supply
• Graveyard = Void
• Library = Archive

TURN

• Combat step = Battle step
• Turn = Cycle
• Untap step = Disengagement step

SUPERTYPES

• Basic = Standard
• Legendary = Distinguished
• World = Political

TYPES

• Artifact = Device
• Creature = Unit
• Enchantment = Development
• Instant = Tactic
• Land = Resource
• Planeswalker = General
• Sorcery = Strategy
• Tribal = Faction

SUBTYPES

• Aura = Modification
• Arcane = Archaic
• Forest = Biolute
• Plains = Lux
• Island = Gelidine
• Mountain = Carbos
• Swamp = Necroleum

ACTIONS

• Activate = Initiate
• Attack = Assault
• Block = Intercept
• Control = Command
• Counter = Disrupt
• Deal = Inflict (deal damage to = inflict damage on)
• Destroy = Annihilate
• Exile = Displace
• Prevent = Negate
• Sacrifice = Forfeit
• Tap = Engage
• Trigger = Automate
• Untap = Disengage

KEYWORDS

• Deathtouch = Deathray
• Defender = Defence
• Double strike = Salvo range
• Enchant X = Modify X (enchanted = modified)
• Equip = Arm (equipped = armed)
• Fear = Dread
• First strike = Range
• Flash = Ambush
• Flying = Orbital
• Haste = Speed
• Intimidate = ?
• Landwalk = Infiltrate
• Xwalk = Infiltrate X
• Lifelink = Inspirit
• Protection from X = Immunity from X
• Reach = Flak
• Regenerate = Shield
• Scry = Scan
• Shroud = Cloaking
• Trample = Overpower
• Vigilance = Stabilize
• Buyback = Recuperate
• Cascade = Surge
• Changeling = Auxiliary
• Cycling = Convert (cycled = converted)
• Xcycling = Convert to X
• Delve = Ransack
• Devour = Replacements (devoured = replaced)
• Dredge = Prospect
• Echo = Reverberate
• Evoke = Induce
• Exalted = Heroic
• Fading = Batteries (battery counters)
• Flashback = Repeat
• Imprint = Designate
• Kicker = Subsidiary (kicked = subsidized)
• Landfall = Planetfall
• Level up = Upgrade (mark counters)
• Madness = Hysteria
• Morph = Deploy
• Persist = Endure
• Rebound = Double tap
• Shadow = Neuromancy
• Split Second = [Absolute]
• Sunburst = [Refraction]
• Suspend = Stasis (time counters; suspended = in stasis))
• Threshold = [Inception]
• Unearth = Reenact
• Vanishing = Fleeting (time counters)
• Wither = [Erode]

Of course, you don't have to follow these conventions. They're just conventions.

That is incredibly useful. Thank you Alex.

http://multiverse.heroku.com/cardsets/79/details_pages/67

In particular, even though the card type didn't exist back then, Planeswalker was canonically translated as "Warlord", not "General".