Among individual stocks, Thomson Reuters TRI.TO said it had agreed to acquire Casetext, a legal startup with an artificial intelligence-powered assistant for law professionals, in a $650-million all-cash deal. June 27 (Reuters) - Futures for Canada's resources-heavy main stock index were subdued on Tuesday as investors remained cautious ahead of a key domestic inflation reading, while lower oil prices also dented sentiment. Canadian investment firm Brookfield's BN.TO insurance arm offered to buy American Equity Life Holding AEL.N in a deal valued at nearly $4.3 billion.