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To make better use of the heal mechanics with reducing strength, think about Vanellope von Schweetz Sugar Rush Princess and Vanellope von Schweetz Candy Mechanic as a Shift target that does the same

Yes, you can counter a triggered ability with specific cards that say counter target triggered ability. Regular counterspells like Counterspell only work on spells, not abilities already on the stack

Cambridge, Massachusetts: Harvard University Press

You may still have to package the cards, but thats often as far as it goes

Some of the cards that are box toppers arent expensive to get on places like Card Kingdom for 50 cents a piece

Abilities that trigger "when [that creature] connives" will trigger.