Giant Tortoise Rarity: Common TYPE: Creature SUBTYPE: Turtle CMC: 2 Mana cost: USD: $1.99 EUR: 0.03 TIX: 0.00 EDHREC RANK: 23023 (1/1) This creature gets +0/+3 as long as it's untapped
The ping trigger is only 1 damage which ain't much when you're starting at 40 life, but it's quickly going to add up and I'd imagine Cindervines can regularly pump out 20+ damage in the span of a game
Reds aggression means that you often get a lot of instant and sorcery spells that dont cost much mana and can deal direct damage to creatures or even other players
Giving your artifact creatures flying/lifelink can be strong, but you have to be built for proliferation effects, artifacts, and payoffs for the actual counters from proliferating
Well, keep in mind the little toggle in the top-right labelled Arena Play Modes
Assuming the opponent is corrupted The Seedcore plus any of the big pump spells - Might of Old Krosa, Scale Up, Vines of Vastwood, Groundswell, Become Immense- is enough poison to close out the game