mtg cards like training grounds WINNING WITH GROUNDS! Rebel Stompy (Legacy Rebel Tribal with Mirror Entity MTG) In Magic A Look Back at Training

Whenever a card is put into an opponent's graveyard from anywhere, put a +1/+1 counter on The Haunt of Hightower

Its a big creature with trample, puts more big creatures into play, and allows for creature-based removal

There are multiple ways to stop opponents from attacking you: Mana tax cards (Ghostly Prison) that force the opponent to choose between casting spells and attacking you Damage reduction cards (Spike Weaver) that threaten to Fog oncoming damage, rendering attacks useless Rattlesnake cards (Archon of Justice) that threaten to blow up the attacking opponent's resources The sticking point is that these pillowfort cards are all visible on the board, so opponents know what could happen if they attack you and convinces them to go attack someone else

Pandemonium and Warstorm Surge have one target each, while Impact Tremors has as many targets as we have opponents