Whenever you cast an instant or sorcery spell, if it targets one or more other permanents you control, create a token that's a copy of one of those permanents.
When a spell or ability an opponent controls causes you to discard this card, create a token that's a copy of target permanent.
Orvar churns out token copies of your best permanents every time you cast a cheap instant or sorcery that targets them, snowballing into overwhelming value or a combo finish. You spend the early game ramping and protecting Orvar, then chain cantrips, bounce spells, and protection spells that incidentally target your own creatures, lands, or artifacts. Each copy compounds your board, mana, and engines until you bury opponents or assemble an infinite loop.
Generates explosive card and board advantage from cheap, replayable spells
Mono-blue gives access to the best counterspells, card draw, and protection
Token copies of mana rocks/lands enable huge ramp and combo potential
Highly flexible—any targeted spell becomes a value engine
Changeling makes Orvar relevant for tribal synergies and creature-type payoffs
Extremely commander-dependent; stalls hard if Orvar is repeatedly removed
Mono-blue lacks efficient removal and life gain
Token copies are legend-vulnerable and can be wiped by board wipes
Needs setup pieces on board before spells generate value
Telegraphs combo lines, inviting interaction from blue-heavy tables