You probably should word it "comes into play with a charge counter on it for each U spent to cast it" and "protection from converted mana cost less than or equal to the number of charge counters on ~."
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Chronoscopic Sorcery 3UUU
You may pay costs for spells you cast at any time that spell is on the stack, resolving, or a triggered abilty that triggered during that spells resolution is on the stack or resolving. if you can't, rewind the game to before you cast it, discard it, and lose 5 life.
Everlasting Torture
:2mana::symr::symr::symr::symr:
whenever a red instant you control deals damage to a player, add that much to your mana pool. Spend this mana only to cast red instants.
Bad wording is bad.
Cards don't usually say must.
Spellshaper behemoth
creature-spellshaper beast2GB
At the begining of your main phase, (you must) discard two cards.
Flying, Hexproof
5/5
Instant
If an instant owned
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Chronoscopic Sorcery
3UUU
You may pay costs for spells you cast at any time that spell is on the stack, resolving, or a triggered abilty that triggered during that spells resolution is on the stack or resolving. if you can't, rewind the game to before you cast it, discard it, and lose 5 life.
:2mana::symr::symr::symr::symr:
whenever a red instant you control deals damage to a player, add that much to your mana pool. Spend this mana only to cast red instants.
:2mana::symw::symu::symu::symu::symb: