giant yugioh card Yu-Gi-Oh! Rat SYE-020 – Stone Giant | Yu-Gi-Oh! Wiki

Not only do decks playing those cards in EDH get another copy (assuming they play blue), but it's only half the card

It's a great building block for green decks to ramp into more powerful spells and creatures

The Ink Flood, The Hero + The Inklands

If a spell or ability you control would counter a spell, instead exile that spell and you may play that card without paying its mana cost

This powerful effect allows players to destroy all other cards on the board when it is activated, thus making Evilswarm Exciton Knight a potent threat at any point in the game if the opponent has carelessly set up their board

Or, perhaps the best case of all is that synergy is built into your deck on the whole